The CrossFit exercise is a high-intensity and high-repetition training program that was created in 1995. The CrossFit exercise is a combination of various movements, including track and field, gymnastics, weight lifting, resistance exercise and swimming. The CrossFit exercise, which combines high-intensity interval training and circuit weight training, can meet the ACSM's recommended exercise training prescription guidelines. It has been shown that the CrossFit exercise training can improve physical fitness. In addition, the CrossFit exercise may not result in higher injury risk compare to other exercise training methods.