Warm-up exercise before exercise: bend the head back and forth, stretch the neck muscles, and repeat 10 times. One arm goes back around the shoulder, and then both arms go around the shoulder at the same time. One hand extends to the opposite shoulder through the back of the head, with the tip of the elbow pointing upward, and the other hand holds the elbow and pulls it to the opposite side. Switch arms. Repeat. Move your hands together from your shoulders and waist until your hands are clenched behind your back, and then stretch together. Lift one arm, bend to the opposite side and stretch as far as possible. Switch arms. Repeat. Sit on the ground, straighten your legs and feet forward, touch your toes with your hands forward, hold them, and repeat. Sit on the ground with your legs straight, bend your body to one side and let your nose come out to your knees; Sitting on the ground repeatedly on both sides, one leg is straight forward, the other leg is bent backward (the outer thigh is upward), the trunk is stretched forward, and then falls backwards. Repeat several times, and then change the other leg. Turn your ankles clockwise and counterclockwise at the same time.