If you squat down and rest immediately after fitness exercise, it will hinder the blood circulation of lower limbs, affect the blood circulation and deepen the fatigue of the body. In severe cases, gravity shock will occur. Therefore, after each exercise, we should adjust the breathing rhythm, walk and swing our arms, do some relaxation and adjustment activities, and promote the blood of limbs to return to the heart, so as to pay off the "oxygen debt", speed up physical recovery and eliminate fatigue.