PRISONER SQUAT Target Muscle: quadriceps. hamstrings. glutes. Anatomical Movement: Sitting down, Hip flexion, and Knee flexion. CROSS PLANK Target Muscle: muscle in abdominals, lower back, arms, and shoulders. Anatomical Movement: Push up position, Knee flexion, Arm flexion. GLUTE BRIDGE Target Muscle: Gluteus maximus, Quadriceps. Hamstrings. Anatomical Movement: Laying down, Heels into the floor, Tighten glutes. AB PLANK Target Muscle: Pectoralis Major, External Oblique, Serratus Anterior Anatomical Movement: Push up position. Strengthens the Wrists and Hands. The wrist bends back toward the top of the forearm. CRUNCH Target Muscle: Rectus Abdominis. External Oblique. Rectus Femoris Anatomical Movement: rectus abdominis generates force, shortens, pulls on bones. pulling the ribcage toward the pelvis. controlling the torso as it moves back to an extended position.