1. Define Physical Fitness. - Physical Fitness is the capability of our body to perform our everyday activities without feeling fatigue when you are doing those activities. Being physically fit means you are healthy and in well-being and doing physical activities may seem easier as your body are fit. 2. Describe each of the FITT Principles of Exercise. What does each letter mean? Explain using your own words. -The letters F.I.T.T. stands for, Frequency, Intensity, Time, and Type. Frequency is how often you do the exercise. Intensity is how hard you do the exercise and it is based in your heart rate. Time is how long/duration of the exercise that you are doing. Type is the mode of exercise that you are going to do, is it aerobics or anaerobic exercise.