In order to prevent strain and improve flexibility, there will be some fatigue after exercise. Static stretching can reduce the movement of the body to prevent strain and gradually increase flexibility. Restore heart rate, adjust the state, the heart rate is still high soon after exercise, and give the body a buffer time during static stretching to slow down the heart rate; Stretch muscles and reduce soreness. Proper stretching helps to relieve muscle soreness and make muscle lines look better.