With the help of the fitness ball, the left side of the thin waist lies on the fitness ball, the left side of the body is attached to the spherical surface, the elbow is bent behind the head, the legs are straight, and the right leg is crossed in front of the left leg. Lift the upper body with waist and abdomen strength, then stay at the highest point for a few seconds before returning to the original position. Repeat several times on each side. Shape the slender lines of the whole body and lie on the ground, straighten your hands forward, open them shoulder-width, bend your legs slightly, and stretch your toes backwards. Lift your hands and feet off the ground at the same time, stop at the highest point, and then slowly put them down. Repeat this action several times.