Received: 22 October 2018 Revised: 21 December 2018 Accepted: 27 December 2018 DOI: 10.1002/bin.1659 LITERATURE REVIEW A review of behavioral interventions to enhance sports performance† Merritt Schenk | Raymond Miltenberger Child and Family Studies, University of South Florida, Tampa, Florida, USA Correspondence Raymond Miltenberger, Child and Family Studies, University of South Florida, Tampa, FL 33620, USA. Email: miltenbe@usf.edu Research on applied behavior analysis and sports performance has become an increasingly popular subject. It involves using behavioral measures to assess the utility of numerous interventions to enhance athletic performance. We identified 101 studies published since the late 1960s focusing on behavioral interventions to enhance sports performance. To determine the breadth of the current research, we identified each sport and the different interventions used to improve performance. Of the studies included in this review, research has investigated 23 interventions with 21 sports. The purpose of this paper is to review the current literature regarding what procedures have been evaluated, the results of this research, some of the limitations, and future directions of behavioral research on sports performance enhancement. In doing so, this review will allow readers to easily browse the current literature by the sport or intervention of interest. KEYWORDS applied behavior analysis, sports, sports performance enhancement 1 | I N T RO DU CT I O N Behavior analytic research on sports performance has been published as early as the late 1960s. It appears that Rushall and Pettinger (1969) published the first sports‐related behavioral research in Research Quarterly, and shortly after Rushall and Siedentop (1972), in Development and Control of Behavior in Sports and Physical Education, broadly described various methods that could be used to apply behavior analysis to sports. Following this early work, more researchers began publishing articles regarding sports and behavior analysis. For example, Komaki and Barnett † The authors thank Trevor Maxfield for his contributions to the research. 248 © 2019 John Wiley & Sons, Ltd. wileyonlinelibrary.com/journal/bin Behavioral Interventions. 2019;34:248–279. SCHENK AND MILTENBERGER 249 (1977) demonstrated that instruction, feedback, and positive reinforcement increased football players' correct play execution. Other procedures, such as negative reinforcement (Allison & Ayllon, 1980), modeling and prompting (Fitterling & Ayllon, 1983), self‐monitoring and graphical feedback (Critchfield & Vargas, 1991), behavioral rehearsal and feedback (Rush & Ayllon, 1984), simulated practice (Scott, Scott, & Howe, 1998), and behavioral skills training (BST; Tai & Miltenberger, 2017) have also been implemented to enhance sport performance. Although most of these studies use a multicomponent intervention, they often assess novel component combinations or apply an intervention to a scarcely studied or unstudied sport or target behavior. A recent poll found that three quarters of adults in the United States played sports when they were younger, and one quarter of adults continue to play sports throughout their lives, with more than 50 different sports included (Sports and Health in America, 2015). Additionally, participating in sports has numerous physical and social benefits to the athlete. Furthermore, it is reported that 63% of people in the United States describe themselves as sports fans (Carroll, 2005). This demonstrates the significance of sports within society and indicates the importance of a continued focus on the research of sports‐related behavior. Perhaps as a result of the prevalence of professional sports and the widespread participation in sports across countries, there has been a proliferation of sports research in the field of applied behavior analysis (ABA) over the past several decades. Recent publications (e.g., Luiselli & Reed, 2015; Martin, 2015) describe how behavior analytic techniques have been utilized to address a wide range of behaviors across multiple sports and populations. This research is based on principles and procedures of behavioral science established over the past 80 or more years (Granpeesheh, Tarbox, & Dixon, 2009; Martin, Thompson, & Regehr, 2004). Therefore, a continued interest in the application of ABA in sports seems warranted. Although other publications have emphasized the utility of behavioral science in sports (e.g., Lee, 1993; Luiselli & Reed, 2011; Martin, 2015; Rushall, 1975; Rushall & Siedentop, 1972) and reviewed directions of behavioral research regarding sports (e.g., Luiselli & Reed, 2015), the last study to review the literature regarding ABA applications to enhance sports performance was Martin et al. (2004). Much research on ABA and sports has been published since publication of the Martin et al. paper in 2004. Furthermore, Martin et al. was limited in that it only reviewed articles with single‐subject designs. Thus, there is not a current review comparing and contrasting the various behavioral procedures that have been used to enhance sports performance and the different sports targeted with a behavioral intervention. The purpose of this paper is to review the research applying behavior analytic procedures to performance enhancement across sports. 2 2.1 METHOD | | Inclusion and exclusion criteria Two inclusion criteria were used to identify studies for review. First, a behavioral intervention had to be implemented in each study. A behavior intervention includes using any form of an intervention that might alter an observable behavior. Second, the target behavior was sport performance consisting of the measurement of an athlete's observable behavior. Regarding performance enhancement, a sports intervention can target the behavior of the individual playing the sport, or it can target the behavior of the individual coaching the players. Studies were excluded if the focus was solely on physical activity (i.e., exercise promotion) rather than sports performance. Although increasing physical activity can be part of sport performance enhancement, the purpose of such research is generally on health outcomes as opposed to performance enhancement. Additional sports‐related studies were excluded if the focus was therapeutic instead of performance based (e.g., using a sports activity to decrease anxiety), the focus was not on performance of a skill related to an organized sport (e.g., throwing a ball), and if the study was not written in English. 250 2.2 SCHENK AND MILTENBERGER Search criteria | We searched the literature via databases using the specific search terms “Sports” and “Behavior Analysis” together. These terms were searched in databases of PsychINFO, ERIC, PsychArticles, and Education: A SAGE full‐text collection, from which 146, 20, 96, and 26 articles were identified, respectively. We identified other studies by cross‐checking reference lists of published articles and book chapters. All studies were then evaluated using the inclusion criteria. 2.3 Interobserver agreement | Interobserver agreement (IOA) was calculated by having independent reviewers assess the different types of interventions used in each study and then dividing the number of agreements by the number of agreements plus disagreements. IOA was conducted for all included articles. In order to get to near 100% agreement, the lead author and research assistant independently evaluated every article. Then, the research team reevaluated any articles with which there were disagreements in order to conclude which interventions were used. This resulted in a final IOA score of 100% and seemed most appropriate to ensure the highest degree of confidence regarding the content of the reviewed studies. 2.4 Sports studied | Performance in 21 different sports was assessed across the studies that met inclusion criteria, but some sports were categorized together for simplicity. For example, many sports such as golf, swimming, and basketball are not ambiguous. However, some sports require further clarification. Football in this paper refers to American football, and soccer is used for what other countries generally call football. Baseball includes baseball and softball. Martial arts is used as a broad term to describe more specific forms such as Judo, Aikido, or Capoeira. Gymnastics refers to any sport that takes place in the gymnastic setting (e.g., balance beam or floor exercise). Dancing refers to any form of competitive dance. Skating refers to any form of competitive skating. Track and field is used to describe any event that normally takes place in track or field competition (e.g., running, pole vault, and discuss). Also, tennis refers to tennis or table tennis. 2.5 Procedures studied | Several categories of procedures were identified throughout the literature. Certain procedures were consequences of the target behavior (e.g., reinforcement), whereas others were antecedents of the target behavior (e.g., instruction or modeling). Additionally, some procedures, although occurring after the target behavior occurred, were not considered a consequence of the behavior. For example, verbal feedback is not decidedly reinforcement; instead, it could conceivably be a contingency‐specifying stimulus that describes the behavior that will result in reinforcement. Additionally, some procedures were designed to teach a certain skill set that would, in turn, result in performance enhancement (e.g., relaxation training or visual imagery). Categories of procedures and their descriptions follow. 2.5.1 | Consequence procedures Procedures were categorized as consequence procedures when some stimulus was introduced contingent on performance and was clearly described to function as reinforcement or punishment. SCHENK AND MILTENBERGER 251 Positive and negative reinforcement A reinforcement procedure is any programmed consequence delivered or removed contingent on behavior intended to increase the likelihood of that behavior occurring. We only included studies as using positive or negative reinforcement if it was explicitly stated in the study that positive or negative reinforcement was a programmed component of the intervention, or if praise, positive feedback, or specific social positive statements (e.g., “great job,” “well done,” etc.) were provided by the behavior change agent contingent on a correct target response. Auditory feedback This procedure, sometimes referred to as Teaching with Acoustical Guidance (TAGteach; Quinn, Miltenberger, & Fogel, 2015), involves providing auditory feedback (a click from a clicker) when a subject correctly performs a step in a specific behavioral sequence. The auditory feedback has been shown to function as a form of reinforcement as it increases correct performance of multiple skills (Quinn, Miltenberger, James, & Abreu, 2016). Token reinforcement A token reinforcement procedure uses specific conditioned reinforcers that can be exchanged for other reinforcers at a determined time. A token reinforcement intervention component was included only if it was explicitly stated that a token economy or token reinforcement was used to enhance performance. Chaining Chaining is a method used to teach a complex behavior by breaking it into a number of steps and teaching the steps one at a time (through prompting, fading, and reinforcement) starting with the last step or with the first step and proceeding sequentially until the entire sequence of behaviors occurs together. 2.5.2 | Antecedent procedures Procedures were categorized as antecedent procedures when the stimulus was introduced at the beginning of each session or trial or before the behavior occurred in an attempt to evoke the behavior. Instruction Instruction includes any time an experimenter or coach provided specific statements, descriptions of expected behavior, or verbal prompts to a coach or player as instruction for expected performance. Goal setting Goal setting involves setting clear, measurable goals for performance stated as a specified unit of behavior to be achieved (e.g., swim × laps in 10 min). Expert modeling Expert modeling includes any time an individual demonstrated the target behavior for a subject. The expert could be a coach, a professional athlete, or any other individual considered to correctly execute the behavior for the purpose of modeling. Expert modeling could be live or delivered via video. Video modeling or instruction Video modeling or instruction includes any time a visual electronic device (e.g., TV or computer screen) was used to provide verbal and or visual instruction including words, diagrams, and images of people engaging in the target behavior. This procedure was included anytime it was explicitly stated that a visual electronic device was used, and it was clearly stated that this device was used to provide instruction or modeling as an intervention component. 252 SCHENK AND MILTENBERGER Sometimes, the video modeling would use an expert model. Thus, both procedures would have been included for such a study (e.g., Zetou, Tzetzis, Vernadakis, & Kioumourtzoglou, 2002). Physical prompting A physical prompting procedure, in which a coach or researcher manually guided the athlete's behavior, was included only if it was explicitly stated that physical prompting was a programmed intervention component. 2.5.3 | Feedback procedures Procedures were categorized as feedback procedures when information about the athletic performance just exhibited was introduced following an instance of behavior. Verbal feedback Verbal feedback includes any time the experimenter, coach, or peer provided statements about performance in response to a subject engaging in the target behavior. We did not categorize the procedure as verbal feedback if it was used as a component of video feedback. Video feedback Video feedback includes any time a visual electronic device was used to provide feedback to a subject following his or her engagement in the target behavior. When video feedback was used, verbal comments (verbal feedback) on the behavior in the video were also provided. Self‐monitoring Self‐monitoring is anytime the subjects of the study keep a record of their engagement in the target behavior. In some studies, this was also called self‐recording. Public posting Public posting is when participants' performance data are posted in a place visible to a variety of people to influence athletic performance. Graphical feedback Graphical feedback is any time graphs are used to provide subjects feedback regarding their athletic performance. However, if graphical feedback was posted so others could observe the graphed data, the procedure was only categorized as public posting. 2.5.4 | Skill training procedures Procedures were categorized as skills training procedures if they included teaching and requiring the subjects to engage in some behavior that was not necessarily the target behavior but as a result improved their correct engagement in the target behavior. Self‐talk Self‐talk is a procedure that varies slightly across studies but in all cases focuses on covert verbal behavior consisting of positive thoughts to control negative thoughts, which might help facilitate performance enhancement. SCHENK AND MILTENBERGER 253 Self‐imagery Self‐imagery is a procedure that varies slightly across studies but in all cases focuses on covert behavior where the subject imagines some event that can or has happened resulting in performance enhancement. Self‐imagery was called imagery rehearsal and mental practice in some studies. Relaxation training Relaxation training refers to breathing, stretching, and covert verbal or imaginal exercises that are purported to help an individual obtain a calm and focused mental state or decrease anxiety or autonomic arousal, resulting in performance enhancement. This is different from self‐talk and self‐imagery because the covert component of self‐talk and self‐imagery is to focus on the target behavior, whereas the covert component of relaxation training is to focus on reducing muscle tension and other physiological stresses that can affect performance. Behavioral rehearsal Behavioral rehearsal refers to anytime the subject was required to engage in the target behavior outside the context of critique or other intervention components with the intended purpose of improving the subject's ability to correctly engage in the target response. This procedure was also referred to as practice, imitation, or role‐playing in some studies. Simulated practice Simulated practice refers to any instance where the subject engaged in some form of the target response in a setting involving some form of a visual electronic simulated setting to promote performance enhancement in the actual setting. Some responses were verbal, some were remote controlled, and some were physical responses. These responses then resulted in performance enhancement of the target motor skill‐related behavior. This was also referred to as virtual practice at times. Acceptance and commitment therapy Acceptance and Commitment Therapy (ACT) refers to a covert exercise intended to help individuals accept their current thinking patterns and eventually commit to overt action to allow them to adequately deal with specific problems, resulting in performance enhancement (see Hayes, Luoma, Bond, Masuda, & Lillis, 2006). 2.5.5 | Other procedures Procedures were categorized as other procedures when they included multiple components and types of procedures that were used concurrently. Behavioral skills training BST refers to a specific intervention involving the systematic use of instruction, modeling, rehearsal, and feedback (see Himle, Miltenberger, Gatheridge, & Flessner, 2004). Habit reversal Habit reversal refers to a multicomponent intervention in which a participant is provided awareness training, taught a certain competing response, and experiences specific contingencies that facilitate correct responding (see Miltenberger, Fuqua, & Woods, 1998). Discrimination training Discrimination training refers to learning to engage in specific behavior in the presence of appropriate discriminative stimuli (e.g., swing a bat in a precise way when a baseball is thrown to spin at a certain rate). 254 TABLE 1 SCHENK AND MILTENBERGER Published studies sorted by sport Sport Target behavior Procedures Citation Baseball Teach how to hit ball and recognize balls and strikes Increase individual offensive efficiency average Improve curveball hitting performance Backward chaining, discrimination training Money as Sr+ (Simek & O'Brien, 1988) (Heward, 1978) Discrimination training by cue fading (Osborne, Rudrud, & Zezoney, 1990) (Little & Simpson, 2000) Basketball Decrease response to negative thoughts to improve overall baseball performance Acceptance and commitment therapy Increase foul shooting percentage Improve foul shooting accuracy Relaxation training, self‐imagery, video modeling Instruction, verbal feedback, video modeling, video feedback, expert modeling Relaxation techniques, self‐talk Improve foul shooting accuracy Relaxation techniques, self‐imagery Improve foul shooting accuracy Goal setting, self‐imagery Improve overall field‐goal percentage Relaxation techniques, self‐imagery, video highlights with inspirational music Social positive reinforcement, punishment (Time out from practice) Imagery rehearsal, self‐talk, relaxation techniques Improve shot form Decrease fouls, increase “assertiveness” Increase correct execution of defensive performance Improve foul shooting accuracy Cycling Dancing Football Teach individuals to be proficient in 9 essential basketball skills Improve shot accuracy Verbal feedback, instruction, social positive reinforcement Instruction, expert modeling, forward chaining, Sr+, physical prompting Self‐imagery Improve standing start Verbal feedback, video modeling Improve pressure distribution when pedaling Improve pressure distribution when pedaling Auditory feedback, graphical feedback Improve ability to engage in specific competition related movements Improve efficiency of three specific dance steps Auditory feedback, video feedback (Hamilton & Fremouw, 1985) (Kearns & Crossman, 1992) (Lerner, Ostrow, Yura, & Etzel, 1996) (Templin & Vernacchia, 1995) (Connelly, 1988) (Kendall, Hrycaiko, Martin, & Kendall, 1990) (Kladopoulos & McComas, 2001) (Lambert et al., 2016) (Shapiro & Shapiro, 1985) (Jennings, Reaburn, & Rynne, 2013) (Broker, Gregor, & Schmidt, 1993) (Sanderson & Cavanagh, 1990) Auditory feedback (Quinn et al., 2016) Public posting, praise as Sr+ (Quinn, Miltenberger, Abreu, & Narozanick, 2017) (Quinn et al., 2015) (Fitterling & Ayllon, 1983) Improve movement proficiency Improve execution of three specific ballet exercises Auditory feedback Social positive reinforcement, verbal feedback, instruction, expert modeling, physical prompting, rehearsal Improve execution of route running and blocking Improve execution of offensive blocking Public posting Improve execution of tackling technique Improve efficiency of movement and play execution of offensive backfield (Hall & Erffmeyer, 1983) (Aiken, Fairbrother, & Post, 2012) Instruction, verbal feedback, social positive reinforcement, expert modeling, rehearsal TAGteach, instruction, shaping Instruction, verbal feedback, social positive reinforcement (Ward, Smith, & Sharp, 1997) (Allison & Ayllon, 1980) (Harrison & Pyles, 2013) (Komaki & Barnett, 1977) (Continues) 255 SCHENK AND MILTENBERGER TABLE 1 (Continued) Sport Target behavior Procedures Citation Improve execution of wide receivers' blocking, route running, and initial release Public posting plus verbal feedback, verbal feedback plus goal setting and public posting, verbal feedback plus goal setting Removal of aversive coaching as Sr− (Smith & Ward, 2006) Improve execution of tackling technique Improve execution of tackling technique Improve execution of pass blocking technique Improve execution of tackling technique Improve fluency of movement response to offensive play Improve position accuracy during pass and run plays; increase total tackles made Golf Improve overall shot making Improve club head speed; club face angle; tempo; and tempo consistency Improve chipping form and accuracy Improve all aspects of swing Improve swing form accuracy and decrease swing variability Improve shot accuracy and decrease number of strokes to complete a round Decrease number of strokes to complete a round Gymnastics Hockey Horseback Riding Public posting, goal setting (Stokes & Luiselli, 2010) (Stokes, Luiselli, & Reed, 2010) (Stokes, Luiselli, Reed, & Fleming, 2010) (Tai & Miltenberger, 2017) (Christina, Barresi, & Shaffner, 1990) (Ward & Carnes, 2002) Instruction, backward chaining, expert modeling, Sr+ Graphical (but only data) feedback, verbal feedback, video feedback (Simek, O'Brien, & Figlerski, 1994) (Bertram, Marteniuk, & Guadagnoli, 2007) Instruction, verbal feedback, video modeling, video feedback, expert modeling TAGteach (Post, Aiken, Laughlin, & Fairbrother, 2016) Helmet stickers as Sr+ Verbal feedback, video feedback, TAGteach Behavioral skills training Simulated practice Video feedback, verbal feedback Expert modeling, instruction, backward chaining, Sr+ Self‐monitoring, rehearsal Enhance power and distance control when putting Simulated practice Improve rope dancing/climbing Instruction, verbal feedback, video modeling, expert modeling Improve accuracy and ability to do backward walkovers, front handsprings, and reverse kips Improve accuracy and ability to do a double leg circle on a pommel horse Improve accuracy of three skills on the uneven bars Instruction and verbal feedback, social positive reinforcement, expert modeling, rehearsal Self‐modeling, expert modeling, video modeling Video modeling, video feedback Increase number of beam skills done per practice Goal setting, public posting, verbal feedback, self‐monitoring, graphical feedback, social positive reinforcement Increase number of goalie saves Self‐talk Decrease time in penalty box; decrease number of penalties; increase penalty shot accuracy Self‐imagery Improve execution of three riding skills Video feedback (Fogel, Weil, & Burris, 2010) (Guadagnoli, Holcomb, & Davis, 2002) (O'Brien & Simek, 1983) (Kirschenbaum, Owens, & O'Connor, 1998) (Fery & Ponserre, 2001) (Magill & Schoenfelder‐Sohdi, 1996) (Allison & Ayllon, 1980) (Baudry, Leroy, & Chollet, 2006) (Boyer, Miltenberger, Batsche, & Fogel, 2009) (Wolko, Hrycaiko, & Martin, 1993) (Rogerson & Hrycaiko, 2002) (Silva III, 1982) (Kelley & Miltenberger, 2016) (Continues) 256 TABLE 1 SCHENK AND MILTENBERGER (Continued) Sport Target behavior Procedures Citation Kickball Improve sportsmanship Tangible prizes as Sr+, token economy Increase attentive behavior and decrease disruptive behavior to improve performance Token economy (Hupp, Reitman, Northup, O'Callaghan, & LeBlanc, 2002) (Reitman, Hupp, O'Callaghan, Gulley, & Northup, 2001) Improve accuracy in performing certain techniques Increase variability and generality of punching and kicking techniques Video feedback Martial Arts Rowing Decrease time taken to complete race Decrease time taken to complete race Increase total distance covered during a 40‐min period Social positive reinforcement (Differential reinforcement) (BenitezSantiago & Miltenberger, 2016) Harding, Wacker, Berg, Rick, & Lee, 2004 Goal setting, relaxation techniques, self‐imagery, self‐talk Goal setting, relaxation techniques, self‐imagery, self‐talk Instruction (associative video tape), two different dissociative video tapes (music or past race) (Thelwell & Greenlees, 2001) (Thelwell & Greenlees, 2003) (Scott, Scott, Bedic, & Dowd, 1999) Rugby Increase number of ball carries, tackles made, successful kicks, and takeaways won Goal setting (Mellalieu, Hanton, & O'Brien, 2006) Skating Improve execution of correct relay tagging Improve symmetry of circles and quality of turns across multiple “figures” Improve execution of all “figures” Increase number of jumps and spins performed; increase number of times practicing routine with music; decrease off‐task behavior Increase number of laps and drills completed; decrease off‐task activity; decrease time taken to complete race Graphical feedback, verbal instruction, social positive reinforcement Instruction, self‐talk (Anderson & Kirkpatrick, 2002) (Ming & Martin, 1996) Self‐talk Instruction, verbal feedback, self‐monitoring (Palmer, 1992) (Hume, Martin, Gonzalez, Cracklen, & Genthon, 1985) Goal setting, self‐talk, self‐imagery, self‐monitoring (Wanlin, Hrycaiko, Martin, & Mahon, 1997) Instruction, verbal feedback, social positive reinforcement, physical prompting Social positive reinforcement, verbal feedback, expert modeling, rehearsal Instruction, rehearsal, simulated practice, verbal feedback Public posting, goal setting, verbal feedback Video feedback (Luyben, Funk, Morgan, Clark, & Delulio, 1986) (Rush & Ayllon, 1984) Soccer Improve execution of side‐of‐the‐foot passing Improve execution of heading, throw‐ins, and goal kicks Improve execution of receiving and passing the ball Improve on‐field position Increase number of effective coaching strategies used by coaches Swimming Teach three swimming skills Instruction, physical prompting Increase number of laps swam Self‐monitoring, verbal feedback Improve execution of general swimming technique in children with spina bifida Decrease stroke errors; increase correct stroke execution Video feedback Video feedback, expert modeling, rehearsal, instruction, verbal feedback (Ziegler, 1994) Brobst and Ward (2002) (Partington, Cushion, Cope, & Harvey, 2015) (Rogers, Hemmeter, & Wolery, 2010) (Schonwetter, Miltenberger, & Oliver, 2014) (Dowrick & Dove, 1980) (Hazen, Johnstone, Martin, & Skrikameswaran, 1990) (Continues) 257 SCHENK AND MILTENBERGER TABLE 1 (Continued) Sport Tennis and Table Tennis Target behavior Procedures Citation Decrease stroke errors (Koop & Martin, 1983) Decrease number of total strokes Expert modeling, physical prompting, punishment, verbal feedback, social positive reinforcement Self‐monitoring, public posting Increase number of lengths swam Self‐monitoring, graphical feedback Increase productive behavior; decrease nonproductive behavior Improve practice attendance and overall work output Increase coaches correct use of rewards and feedback Increase number of laps swam Music provided as Sr+ Self‐monitoring, instruction (Polaha, Allen, & Studley, 2004) (Critchfield & Vargas, 1991) (Hume & Crossman, 1992) (McKenzie & Rushall, 1974) (Rushall & Smith, 1979) Attention, candy, and money as Sr+ (reinforcer preference assessment) (Rushall & Pettinger, 1969) Improve overall serve Instruction, video modeling Improve serve form and accuracy Instruction, video modeling, video feedback, expert modeling Improve non‐dominant forehand volley Improve correct hitting trajectory Instruction, verbal feedback, Sr+, video modeling, expert modeling Instruction, verbal feedback, video modeling, video feedback, simulated practice, expert modeling Instruction and verbal feedback, social positive reinforcement, expert modeling, rehearsal Social positive reinforcement (DR) (Bouchard & Singer, 1998) (Emmen, Wesseling, Bootsma, Whiting, & Van Wieringen, 1985) (Hebert & Landin, 1994) (Todorov, Shadmehr, & Bizzi, 1997) Improve execution of forehand, backhand, and service swings Improve execution of forehand, backhand, and service swings Improve execution paddle swing Improve strategic ball‐placing performance Improve execution of service swing Improve execution of service return Improve execution of service swing Improve execution of forehand and backhand swings Decrease inappropriate outbursts Decrease inappropriate outbursts Improve execution of service return Track and Field Decrease time taken to complete race Decrease time taken to complete race Increase distance of hammer and discus throw; increase correct execution of throwing form Increase total distance ran Increase height of pole extension when approaching launch point Volleyball Improve receiving the ball Self‐monitoring, public posting Video modeling, expert‐modeling, physical prompting, verbal feedback, video feedback Self‐talk (Allison & Ayllon, 1980) (Buzas & Ayllon, 1981) (Carroll & Bandura, 1982) Self‐talk, instruction (Landin & Hebert, 1999) (Rikli & Smith, 1980) (Scott et al., 1998) (Van Wieringen, Emmen, Bootsma, Hoogesteger, & Whiting, 1989) (Ziegler, 1987) Habit reversal Verbal instruction, public posting Video modeling, simulated practice (Allen, 1998) (Galvan & Ward, 1998) (Haskins, 1965) Relaxation techniques, goal setting, self‐imagery, self‐talk Instruction, verbal feedback, expert modeling, rehearsal Instruction, video modeling (Patrick & Hrycaiko, 1998) (Shapiro & Shapiro, 1985) (Maryam, Yaghoob, Darush, & Mojtaba, 2009) (Wack, Crosland, & Miltenberger, 2014) (Scott, Scott, & Goldwater, 1997) Video feedback, instruction Video modeling, simulated practice Video feedback, instruction Goal setting, verbal feedback, visual feedback Verbal prompting, audible sound when goal reached functioned as Sr+ Instruction, expert modeling, video modeling, video feedback (Barzouka, Bergeles, & Hatziharistos, 2007) (Continues) 258 SCHENK AND MILTENBERGER TABLE 1 (Continued) Sport Target behavior Procedures Citation Teach overhand pass and serve Expert modeling, verbal instruction, rehearsal, video modeling Expert modeling, instruction, video modeling, video feedback (Zetou, Fragouli, & Tzetzis, 1999) (Zetou et al., 2002) Improve ball setting and serving Weight lifting Improve execution of power clean Video instruction, rehearsal (Sewal, Reeve, & Day, 1988) Yoga Improve execution of three specific poses Video self‐evaluation and video feedback (Downs, Miltenberger, Biedronski, & Witherspoon, 2015) 3 RESULTS | Using the search criteria and reference lists of other articles, we found 101 articles that met the inclusion criteria of this review. Table 1 provides a summary of these articles categorized by sport. There were 23 different procedures used to enhance performance related to 21 different sports. Numerous behaviors were targeted for improvement across procedures and sports, with 82 different target behaviors across the articles (some studies did assess multiple behaviors simultaneously). Categories of target behaviors include improving general technique and form (e.g., Anderson & Kirkpatrick, 2002 helped speed skaters improve their relay tagging form), increasing work output (e.g., Wolko et al., 1993 increased the number of beam skills engaged in during gymnastic practices), decreasing problem behaviors (e.g., Connelly, 1988 decreased the number of fouls that basketball players committed), improving performance‐related measures (e.g., hockey goalie save percentage, Rogerson & Hrycaiko, 2002), and teaching new skills (e.g., Lambert et al., 2016 taught a teenager with autism to correctly engage in nine essential basketball skills). To address the breadth of the literature, we categorized the articles by sport targeted and by procedures used. 3.1 | Participant characteristics Although not all studies described the age or sex of the participants, a total of 1,523 individuals participated in the studies included, of which 514 children, 997 adults, and 12 did not have their ages listed. Participant ages ranged from 4 to 61. Although all studies focused on performance enhancement of athletes, some studies intervened on the coach's behavior to facilitate performance enhancement. For example, Stokes and Luiselli (2010) demonstrated that altering the number of coach interactions with their players increased the likelihood that a high school football player engaged in proper tackling technique. Of all experiments, 18% improved coach behavior, and 93% improved competitor behavior. Percentages are greater than 100 because some experiments focused both on coaching improvement and competitor performance enhancement. Skill levels for each study included recreational participation (e.g., Rikli & Smith, 1980; 41%), competitive club sport or studio (e.g., Quinn et al., 2015; 31%), collegiate (e.g., Silva, 1982; 25%), high school (e.g., Stokes et al., 2010; 8%), and international (e.g., Scott et al., 1997; 1%). The percentages were calculated using the skill level assessed in each experiment divided by the total number of experiments (109) within all studies. The percentages equal slightly more than 100 because some experiments assessed multiple competition levels. 3.2 | Procedural characteristics Of the 23 different procedures identified, we categorized the following four procedures as consequence interventions: positive or negative reinforcement, auditory feedback, token reinforcement, and chaining (Table 2). Twenty‐three studies implemented a positive or negative reinforcement procedure. For example, Heward (1978) x (Fitterling & Ayllon, 1983) x (Heward, 1978) (Rush & Aylonn, 1984) (Reitman et al., 2001) x x (Quinn et al., 2017) x x (O'Brien & Simek, 1983) (Quinn et al., 2016) x (Luyben et al., 1986) (Quinn et al., 2015) x x (Lambert et al., 2016) x x x x x x x x (Koop & Martin, 1983) x x x x x x x x x (Kladopoulos & McComas, x 2001) (Hupp et al., 2002) (Hume & Crossman, 1992) x x (Hebert & Landin, 1994)+ (Harrison & Pyles, 2013) (Harding et al., 2004) x x (Connelly, 1988) (Fogel et al., 2010) x (Buzas & Ayllon, 1981) (Broker et al., 1993) x x x x x x x x x x x x x x x x x x x x x x x (Continues) x x (Anderson & Kirkpatrick, 2002) x x Citation (Allison & Ayllon, 1980) Additional procedures Forward or Sr+; Auditory Token Verbal Video Public Behavioral Self‐ Expert Graphical Physical Goal backward Sr‐ feedback economy chaining Instruction feedback feedback posting rehearsal monitoring modeling feedback prompting setting Consequence procedure Published studies sorted by consequence‐based interventions Consequence table TABLE 2 SCHENK AND MILTENBERGER 259 (Continued) x x (Stokes & Luiselli, 2010) (Stokes et al., 2010) x x Note. + means that video modeling was also used (Wolko et al., 1993) x x (Simek et al., 1994) (Stokes et al., 2010) x (Scott et al., 1997) (Sanderson & Cavanagh, 1990) Additional procedures x x x x x x x x x x x x Forward or Sr+; Auditory Token backward Verbal Video Public Behavioral Self‐ Expert Graphical Physical Goal Sr‐ feedback economy chaining Instruction feedback feedback posting rehearsal monitoring modeling feedback prompting setting Consequence procedure (Rushall & Pettinger, 1969) x Citation Consequence table TABLE 2 260 SCHENK AND MILTENBERGER SCHENK AND MILTENBERGER 261 provided monetary reinforcement to professional baseball players contingent on successful at bats. At the end of each week, the three players with the highest efficiency average were given monetary reinforcement, resulting in efficiency averages increasing for most of the participants. Seven studies implemented an auditory feedback procedure. For example, Quinn et al. (2015) used TAGteach to enhance the performance of competitive dancers. Each time a student engaged in correct performance of a step in a dance move, the dance teacher provided auditory feedback with a click from a clicker. Three studies implemented token reinforcement procedures. For example, a token reinforcement procedure was used by Reitman et al. (2001) and was shown to be more effective than medication at decreasing disruptive behavior and increasing attentive behavior for students playing kickball. Finally, two studies used forward or backward chaining. For example, O'Brien and Simek (1983) used a backward chaining procedure with mastery criteria to improve shot accuracy of golfers. Once each golfer mastered the easiest and closest shot, the shot difficulty and distance was increased until the golfers reached all mastery criteria. We categorized the following five procedures as antecedent interventions: instruction, goal setting, expert modeling, video modeling, and physical prompting (Table 3). Twenty‐two studies implemented an instruction procedure. For example, Ziegler (1987) provided vocal instruction to teach intermediate tennis players to engage in proper self‐talk techniques. Participants' forehand and backhand return performance was enhanced as a result. Thirteen studies implemented a goal‐setting procedure. For example, Mellalieu et al. (2006) implemented a goal‐ setting procedure to increase engagement in five performance behaviors of Rugby players. In this instance, no additional incentives were provided for reaching their goals, although goal setting is often implemented in conjunction with some form of reinforcement for goal attainment. Nine studies implemented an expert modeling procedure. For example, Shapiro and Shapiro (1985) used expert modeling to enhance the performance of high school track sprinters. Using this procedure in conjunction with others, the runners' correct movements were increased, and incorrect movements decreased, resulting in an improvement in time it took to finish a race. Eight studies implemented a video modeling or video instruction procedure. For example, Boyer et al. (2009) used video modeling in conjunction with video feedback to enhance three gymnastics moves with young gymnasts. The students watched a video on an expert performing the movement and then watched their own performance on video to compare with the expert. Finally, three studies implemented a physical prompting procedure. For example, Fitterling and Ayllon (1983) used physical prompting along with other procedures to increase the ability of young ballet dancers to maintain correct posture while performing four dance exercises. We categorized the following five procedures as feedback interventions: verbal feedback, video feedback, public posting, self‐monitoring, and graphical feedback (Table 4). Twenty‐three studies implemented a verbal feedback procedure. For example, Schonwetter et al. (2014) used verbal feedback along with self‐monitoring to increase the number of laps swam during practice by competitive swimmers. They demonstrated that descriptive verbal feedback helped enhance performance when other interventions might not produce substantial effects. Fourteen studies implemented a video feedback procedure. For example, Kelley and Miltenberger (2016) used video feedback to enhance horseback‐riding skills by recording the target behavior and immediately showing the rider the video while describing the correct aspects of the performance and providing further instruction for incorrect aspects of the performance. Ten studies implemented a self‐monitoring procedure. For example, Rushall and Smith (1979) used self‐ monitoring in conjunction with instruction to enhance a swimming coach's verbal reinforcement repertoire, leading to the performance enhancement of the swimmers. Eight studies implemented a public posting procedure. For example, Ward et al. (1997) used public posting to improve route running of collegiate level football players. They showed that player route running was perfected as a result of publicly posting performance feedback after each practice. Finally, four studies implemented a graphical feedback procedure. For example, Wack et al. (2014) used graphical feedback in conjunction with goal setting and verbal feedback to increase the distance that five college‐age females ran. In some studies, public posting included graphs of subject performance (e.g., Quinn et al., 2017). We categorized the following six procedures as skill training interventions: behavioral rehearsal, self‐talk, self‐ imagery, relaxation training, simulated practice, and an other category that includes complex interventions (Table 5). Twelve studies implemented a self‐talk procedure. For example, Landin and Hebert (1999) demonstrated x x x (Galvan & Ward, 1998) (Hume et al., 1985) (Kladopoulos & McComas, 2001) x x (Hebert & Landin, 1994) (Jennings et al., 2013) x x (Hazen et al., 1990) x (Harrison & Pyles, 2013) (Hall & Erffmeyer, 1983) (Fitterling & Ayllon, 1983) x x x x x x (Emmen et al., 1985) x x (Carroll & Bandura, 1982) (Brobst & Ward, 2002) (Boyer et al., 2009) x x (Barzouka et al., 2007) (Bouchard & Singer, 1998) x (Anderson & Kirkpatrick, 2002) x x x (Allison & Ayllon, 1980) (Baudry et al., 2006) x x (Aiken et al., 2012) Citation Additional procedures x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x* x x x x x x (Continues) x Goal Video Expert Physical Verbal Video Public Behavioral Self‐ Sr+ Graphical TAG Relaxation Self‐ Self‐ setting Instruction modeling modeling prompting feedback feedback posting rehearsal monitoring or Sr− feedback Teach techniques talk imagery Antecedent procedure Published studies sorted by antecedent‐based interventions Antecedent table TABLE 3 262 SCHENK AND MILTENBERGER (Continued) x (Lambert et al., 2016) x x (Rikli & Smith, 1980) (Rogers et al., 2010) x (Scott et al., 1999) (Shapiro & Shapiro, 1985) x x (Scott et al., 1997) (Sewal et al., 1988) x (Rushall & Smith, 1979) (Rush & Ayllon, 1984) x (Post et al., 2016) (Patrick & Hrycaiko, 1998) (O'Brien & Simek, 1983) (Ming & Martin, 1996) x x (Maryam et al., 2009) x x (Magill & Schoenfelder‐Zohdi, 1996) (Mellalieu et al., 2006) x (Luyben et al., 1986) x x (Koop & Martin, 1983) x x (Lerner et al., 1996) Additional procedures x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x (Continues) x x x Goal Video Expert Physical Verbal Video Public Behavioral Self‐ Sr+ Graphical TAG Relaxation Self‐ Self‐ setting Instruction modeling modeling prompting feedback feedback posting rehearsal monitoring or Sr− feedback Teach techniques talk imagery Antecedent procedure (Komaki & Barnett, 1977) Citation Antecedent table TABLE 3 SCHENK AND MILTENBERGER 263 (Continued) Additional procedures x x (Ziegler, 1987) (Ziegler, 1994)+ x x x Note. + means that simulated practice was also used x (Zetou et al., 2002) (Wolko et al., 1993) x x (Ward & Carnes, 2002) (Zetou et al., 1999) x x (Wanlin et al., 1997) x (Wack et al., 2014) x x (Thelwell & Greenness, 2003) x x (Thelwell & Greenlees, 2001) (Van Wieringen et al., 1989) x (Swain & Jones, 1995) x (Todorov et al., 1997)+ x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Goal Video Expert Physical Verbal Video Public Behavioral Self‐ Sr+ Graphical TAG Relaxation Self‐ Self‐ setting Instruction modeling modeling prompting feedback feedback posting rehearsal monitoring or Sr− feedback Teach techniques talk imagery Antecedent procedure (Smith & Ward, 2006) (Simek et al., 1994) Citation Antecedent table TABLE 3 264 SCHENK AND MILTENBERGER x (Bertram et al., 2007) (Guadagnoli et al., 2002) (Galvan & Ward, 1998) (Fitterling & Ayllon, 1983) x x x x (Emmen et al., 1985) x x x x x x (Dowrick & Dove, 1980) (Downs et al., 2015) (Critchfield & Vargas, 1991) (Carroll & Bandura, 1982) (Broker et al., 1993) (Brobst & Ward, 2002) x x (BenitezSantiago & x Miltenberger, 2016) x x (Baudry et al., 2006) (Boyer et al., 2009) x (Barzouka et al., 2007) (Anderson & Kirkpatrick, 2002) x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x (Continues) (Allison & Ayllon, 1980)* x x (Aiken et al., 2012) x x Citation Additional procedures Verbal Video Public Self‐ Graphical Sr+ Auditory Behavioral Video Expert Goal Physical Self‐ Self‐ feedback feedback posting monitoring feedback Instruction or Sr− feedback rehearsal modeling modeling setting prompting talk imagery Feedback procedure Published studies sorted by feedback‐based interventions Feedback table TABLE 4 SCHENK AND MILTENBERGER 265 (Continued) x x (Rush & Ayllon, 1984) x (Rikli & Smith, 1980) (Quinn et al., 2017) (Post et al., 2016) (Polaha et al., 2004) (Partington et al., 2015) x x x x x x x (Magill & Schoenfelder‐ Zohdi, 1996) (McKenzie & Rushall, 1974) x (Luyben et al., 1986) x x x x (Koop & Martin, 1983) x x x x (Komaki & Barnett, 1977) x x x x x (Kladopoulos & McComas, 2001) (Kirschenbaum et al., 1998) (Kelley & Miltenberger, 2016) (Jennings et al., 2013) x x x x x x x x x x x x x x x x x x x x x x (Continues) x x (Hume et al., 1985) x x x (Hebert & Landin, 1994) x x (Hazen et al., 1990) Additional procedures Citation Feedback procedure Verbal Video Public Self‐ Graphical Sr+ Auditory Behavioral Video Expert Goal Physical Self‐ Self‐ feedback feedback posting monitoring feedback Instruction or Sr− feedback rehearsal modeling modeling setting prompting talk imagery Feedback table TABLE 4 266 SCHENK AND MILTENBERGER (Continued) x (Shapiro & Shapiro, 1985) Note. + means that simulated practice was also used. (Ziegler, 1994)+ x x (Wolko et al., 1993) (Zetou et al., 2002) x (Ward et al., 1997) x x x (Ward & Carnes, 2002) (Wanlin et al., 1997) x x (Van Wieringen et al., 1989) x x (Todorov et al., 1997)+ x (Wack et al., 2014) x x x (Smith & Ward, 2006) x x (Stokes et al., 2010) Additional procedures x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Verbal Video Public Self‐ Graphical Sr+ Auditory Behavioral Video Expert Goal Physical Self‐ Self‐ feedback feedback posting monitoring feedback Instruction or Sr− feedback rehearsal modeling modeling setting prompting talk imagery Feedback procedure (Schonwetter et al., 2014) (Sanderson & Cavanagh, 1990) (Rushall & Smith, 1979) Citation Feedback table TABLE 4 SCHENK AND MILTENBERGER 267 Citation x x (Palmer, 1992) (Osborne et al., 1990) (Ming & Martin, 1996) (Little & Simpson, 2000) (Lerner et al., 1996) (Landin & hebert, 1999) (Kirschenbaum et al., 1998) x x x x x x (Kendall et al., 1990) x x x (Kearns & Crossman, 1992) (Hazen et al., 1990) (Haskins, 1965) (Hamilton & Fremouw, 1985) (Hall & Erffmeyer, 1983) x x x x x x x (Fitterling & Ayllon, 1983) x (Fery & Ponserre, 2001) x (Christina et al., 1990) (Allison & Ayllon, 1980)* (Allen, 1998) Additional procedures % + # x x x x x x x x x x x x x x x x (Continues) x Behavioral Self‐ Self‐ Relaxation Simulated Sr+ Verbal Video Video Expert Goal Physical Self‐ rehearsal talk imagery training practice Other Instruction or Sr− feedback feedback modeling modeling setting prompting monitoring Skill training procedure Published studies sorted by skills‐based interventions Skills training table TABLE 5 268 SCHENK AND MILTENBERGER (Continued) x x (Wanlin et al., 1997) (Ziegler, 1987) x x (Thelwell & Greenlees, 2003) x x x x x x x Note. # = Habit reversal; + = ACT; % = Discrimination Training; $ = BST. (Ziegler, 1994) x x (Thelwell & Greenlees, 2001) x x x x (Templin & Vernacchia, 1995) (Tai & Miltenberger, 2017) (Silva III, 1982) x x (Rogerson & Hrycaiko, 2002) (Rush & Ayllon, 1984) x x (Scott et al., 1998) Additional procedures $ x x x x x x x x x x x Behavioral Self‐ Self‐ Relaxation Simulated Sr+ Verbal Video Video Expert Goal Physical Self‐ rehearsal talk imagery training practice Other Instruction or Sr− feedback feedback modeling modeling setting prompting monitoring Skill training procedure (Patrick & Hrycaiko, 1998) Citation Skills training table TABLE 5 SCHENK AND MILTENBERGER 269 270 SCHENK AND MILTENBERGER that a self‐talk procedure helped female collegiate tennis players improve their use of strategic advantages, such as hitting the ball behind their opponent. Nine studies implemented a self‐imagery procedure. For example, Templin and Vernacchia (1995) used a self‐imagery intervention in conjunction with relaxation training to increase the field goal percentage of five male collegiate basketball players. Seven studies implemented a relaxation training procedure. For example, Kearns and Crossman (1992) used relaxation training in conjunction with self‐imagery to increase the percentage of foul shots made by male collegiate basketball players. Seven studies implemented a behavioral rehearsal procedure. For example, Hazen et al. (1990) used behavioral rehearsal in conjunction with multiple other treatment components to improve competitive swimmers' ability to correctly engage in direction transitions between lengths swam. Four studies implemented a simulated practice procedure. For example, Christina et al. (1990) demonstrated that a male collegiate football linebacker increased his directional response accuracy to the opposition during actual play by training response accuracy to a video highlight using a joystick to indicate which movement he would make given the movements of the offense. Furthermore, Scott et al. (1998) used simulated practice to help tennis players identify direction of their opponents serve more quickly by verbally responding to a video recording of an individual's serve. Finally, ACT, BST, habit reversal, and discrimination training interventions were implemented in one study each. For example, Little and Simpson (2000) used ACT to decrease the number of negative thoughts that five collegiate softball players had, in turn, facilitating performance enhancement. Tai and Miltenberger (2017) evaluated BST for teaching safe tackling skills to young football players. They provided instructions listing all the steps in a safe tackle and then modeled safe tacking. They then had the participants practice tackling and provided feedback, pointing out what steps were done correctly and what steps needed to be improved. Allen (1998) demonstrated that a habit reversal intervention helped an adolescent tennis player decrease his angry outburst to increase his overall performance. Finally, Osborne et al. (1990) used discrimination training by placing specific marks on baseballs that were thrown as curveballs and then fading the size of the lines to help collegiate baseball players discriminate between the spin of curveballs and other types of pitches. 3.3 | Study design characteristics The most common experimental design was a multiple baseline across subjects (38). For example, Kladopoulos and McComas (2001) demonstrated that a behavioral intervention increased the number of foul shots made when it was sequentially introduced across three collegiate basketball players. A multiple baseline across behaviors was the second most common design (15). For example, Fogel et al. (2010) showed that four out of five behaviors related to a golf swing were enhanced by sequentially implementing a TAGteach procedure for each behavior and that these behaviors generalized to other golf clubs. Allen (1998) used a multiple baseline across settings to demonstrate that the behavioral intervention helped enhance a tennis player's overall performance by decreasing inappropriate outbursts, first in the practice setting and then in different tournament settings. Eight studies included an ABAB reversal design. For example, Hume and Crossman (1992) showed that contingent music for on‐task behavior increased the amount of productivity by competitive swimmers each time it was implemented. The ABAB design was only appropriate for evaluating interventions that focused on performance enhancement rather than skill acquisition. Five studies included a multielement design. For example, Wolko et al. (1993) demonstrated that one treatment was more effective at increasing the productivity of gymnasts compared with another treatment and a baseline by having the subject experience all conditions during each week and counterbalancing their implementation over the course of the study. Four studies included a changing criterion design. For example, Scott et al. (1998) decreased the amount of time it took competitive tennis players to identify their opponent's serve. This was done by sequentially decreasing the maximum required latency with which the subject was allowed to engage in the correct response. Also, three studies included a multiple‐probe design. For example, Shapiro and Shapiro (1985) demonstrated high school athletes could improve three separate track‐related behaviors by sequentially introducing the intervention across behaviors after an improvement occurred with the previous behavior. Additionally, six studies used modified ABAB designs SCHENK AND MILTENBERGER 271 in which multiple conditions were evaluated. For example, Baudry et al. (2006) demonstrated that the behavioral intervention enhanced the performance of gymnasts more substantially than traditional coaching or specific instructions. Not all studies used designs that clearly demonstrated experimental control, however (25). Such studies included AB case studies (Maryam et al., 2009), group designs with statistical analysis (e.g., Rikli & Smith, 1980), ABA reversal designs (e.g., Polaha et al., 2004), and one study that began assessment with the treatment phase (Christina et al., 1990). 4 | DISCUSSION The focus of this paper was to review published research to highlight the scope of behavioral research related to sports and to summarize the applicability of behavior analysis to sports environments. Overall, this line of research has provided a substantial contribution to behavior analysis by showing that multiple interventions produced meaningful effects across numerous athletic behaviors. All of the included studies used objective behavioral measures, and nearly every study produced discernible improvement in the target behaviors. However, there are particular aspects of the research to discuss. First, there are several terms that have been used non‐operationally throughout the literature. For example, the term “behavioral coaching” has been used to describe a number of different coaching techniques when a behavioral intervention was added, and it is often compared with standard coaching techniques that do not include a behavioral intervention. Most often, behavioral coaching was similar to BST in that it included instruction, modeling, rehearsal, and feedback. However, these four components were not always present in a behavioral coaching intervention, and other components were sometimes added. Seniuk, Witts, Williams, and Ghezzi (2013) provide a full history of the term behavioral coaching and provide an alternative definition to operationalize the term as a behavior analytic technique. We believe the term, behavioral coaching, is sufficiently vague to warrant discontinuing its use. Instead, researchers should identify the specific behavioral interventions they are investigating. Second, somewhat similar to the vague use of behavioral coaching, there is a lack of clarity in the effects of individual intervention components because interventions were generally part of a package. Although these package interventions result in some loss of experimental control (regarding certainty of which component affected behavior), there are several likely reasons that they were used: (a) they produced favorable effects; (b) it is difficult to separate certain components in a sports setting without making the intervention seem peculiar to an athlete, which could, in turn, be detrimental to the intervention process; and (c) the focus of the research is more on performance enhancement in general, as opposed to an analysis of which components best facilitate performance enhancement. Although the last reason seems counterintuitive because identifying the component that best facilitates performance enhancement would allow for the most efficient interventions to be used, when working with athletes, time is of the essence for the participants. Therefore, a desire to improve the science may be trumped by their need to improve performance, although these are not usually mutually exclusive. Some studies (e.g., Rikli & Smith, 1980; Smith & Ward, 2006) have assessed the efficacy of intervention components regarding behavior change, but future research could further assess the components that best facilitate performance enhancement when conducted in a setting that is less time sensitive. Furthermore, future research could assess the utility of different interventions across different sports and age ranges. For example, video feedback might prove useful for adolescents but ineffective for young children, or BST might be effective for teaching a correct golf swing but ineffective for teaching correct swimming strokes. Third, as with many fields, the literature on the application of behavior analysis to sports appears to suffer from a publication bias problem, in that nearly every study reported positive results for the intervention. Very few articles reported partially negative results regarding the intervention. For example, Lerner et al. (1996) found that only goal setting produced improvements in basketball free‐throw shooting for most subjects instead of the package intervention of goal setting and self‐imagery. In fact, the additional procedure of self‐imagery actually diminished behavioral improvement. Osborne et al. (1990) introduced cues as discriminative stimuli to signal types of pitches thrown, and 272 SCHENK AND MILTENBERGER they reported an increase in hitting curveballs. However, this did not appear to generalize to unmarked balls, and players actually hit unmarked balls worse overall during the experiment compared with baseline. Moreover, hitting only increased when larger cues were used, and behavior returned to approximately baseline levels when the cues were made smaller. One reason the abundance of positive results could be a problem is that some studies reported small but significant findings (e.g., Aiken et al., 2012 found their result statistically significant with p = 0.04, but graphical analyses showed little to no difference). Although statistics can identify differences between data sets, statistically significant results are not the same as substantial and socially significant results. A possible explanation for the mostly positive results could be the abundance of package interventions. Thus, by using multiple procedures, it could hedge the bet, so to speak, that interventions would be a success. Although it is encouraging to see the variety of behavioral procedures used to facilitate performance enhancement across sports, readers should exercise caution when all procedures seem to produce similar behavioral improvements. That being said, the focus of the studies was the subject's behavioral improvement, so it is not surprising to see mostly successful interventions. A number of studies were not included in this review even though they focused on sports performance. First, some studies discussed the utility of interventions as opposed to evaluating their implementation (e.g., Crews & Boutcher, 1986; Lacy & Goldston, 1990; Smith, Smoll, & Christensen, 1996; Virués‐Ortega & Martin, 2010). Such studies are useful for expanding the application of behavior analysis, or establishing useful measurement techniques and behaviors of interest, but they were not the focus of this paper. Second, other studies measured and discussed sports performance in the context of providing further applications of behavioral science but did not expand into performance enhancement. For example, different quantitative analytic approaches have been used to demonstrate the application of behavioral science to sports environments. Vollmer and Bourret (2000), Romanowich, Bourret, and Vollmer (2007), and Alferink, Critchfield, Hitt, and Higgins (2009) demonstrated that the matching law could be used to accurately describe basketball players shot selection, and Seniuk, Williams, Reed, and Wright (2015) extended these findings to describe shot selection of professional hockey players. Furthermore, Roane, Kelley, Trosclair, and Hauer (2004) used behavioral momentum theory to describe patterns of behavior in women's college basketball. Although this line of research is providing an exciting direction for behavior analysts, it does not evaluate interventions but rather provides descriptions of behavior analytic principles applied to sports; therefore, we did not include such articles in our review (for an in‐depth review of quantitative analytic techniques as they are applied to sports, see Reed, 2011). Future research could assess the utility of using quantitative models to facilitate performance enhancement and inform interventions. There are multiple gaps in the literature that could be addressed by future research on behavior analysis and sports performance. Although video technology has been extensively used in sports, research could be conducted to identify which components of video technology best facilitates performance improvements. For example, several studies have evaluated the utility of video modeling and video feedback (e.g., Aiken et al., 2012; Post et al., 2016; Todorov et al., 1997) and reported that both procedures helped improve performance. Also, multiple studies have evaluated the utility of video feedback alone (e.g., Guadagnoli et al. 2002; Partington et al., 2015) or video modeling alone (e.g., Maryam et al., 2009) and reported positive results. However, other studies have reported that both of these procedures are not always effective when facilitating performance enhancement (Emmen, Wesseling et al., 1985; Rikli & Smith, 1980; Rothstein & Arnold, 1976; Van Wieringen et al., 1989). The negative results reported in these studies though are likely due to poor experimental designs or the use of dated video technology. Regardless, further research should be done to determine the utility of video technology and its multiple components in enhancing sports performance. One procedure that has not been included in the previous discussion of behavioral analytic procedures in sports is the simulated practice procedure included in this paper. The proliferation of computer‐based technology has influenced nearly every aspect of human behavior including sports and has manifested in several forms. For golf, there are simulators where an individual can actually swing clubs and hit golf balls on a completely simulated golf course. The introduction of the video game console allows players to remotely control avatars that engage in all responses related to virtually every sport. Outside of sports, flight simulators are a common teaching tool that have SCHENK AND MILTENBERGER 273 been shown to decrease the cost of pilot training by reducing the number of in‐flight learning trials by as much as 50% (Lintern, Shepard, Parker, Yates, & Nolan, 1989). The use of flight simulators has also resulted in equal levels of successful performance compared with individuals trained using only actual flight trials (Gopher, Weil, & Bareket, 1992; for further review of the use of simulated environments to facilitate sports performance, see Farrow, 2013). As the technology continues to improve, future research should investigate the utility of simulations in facilitating performance enhancement. Similar to Martin, Thompson, and Regehr (2004), we found no studies that focused on the performance enhancement of professional athletes. This is not surprising, however, as most teams or clubs fund and provide psychological assistance to professional athletes for the benefit of the team. Therefore, inadvertently providing propitious information regarding performance enhancement to rival teams might result in unfavorable advantages to competitors, as many professional teams represent a multimillion dollar organization whose success compared with their rivals can affect income. Interestingly, many of the interventions discussed (e.g., instruction and video feedback) are already being used in most professional sports. Therefore, it would likely prove fruitful if behavior analytic research could expand into the realm of professional sports. Overall, our findings identify the range of behavior‐based sports research on performance enhancement over that last five decades. Our review provides substantial evidence that behavior analysis has much to offer athletes in many sports. Over 100 studies have been conducted, which indicate a variety of behavioral procedures can be used across numerous sports to effectively facilitate performance enhancement. Whether it is playing catch in the backyard with one's parent, scoring a goal to help a team win, attempting to set world records at the Olympics, or simply being an informed casual observer, sports serve an invaluable function in nearly every culture and society, and this body of research establishes methods that can be used to improve an individual's ability to engage in these behaviors. CO MPLIANCE WITH ET HICAL STANDARDS ETHICAL APPROVAL This is a review paper, so no ethical approval was required. INFORMED CONSENT This is a review paper, so no informed consent was required. CONF LICT OF INT E RE ST The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. ORCID Raymond Miltenberger https://orcid.org/0000-0002-6331-298X RE FE R ENC ES Aiken, C. A., Fairbrother, J. T., & Post, P. G. (2012). The effects of self‐controlled video feedback on the learning of the basketball set shot. 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