1, the first one lies on his back and rolls his abdomen, lying flat on the ground, putting his hands on his ears, gently putting them on his ears, with his elbows slightly open at 45 degrees and his knees together, and then slowly lifting his upper body. Be careful not to touch the ground on your shoulders, each group 15 times.

2. Lift your legs on your back for the second time, with your palms facing down and touching the ground. Keep your upper body on the ground, slowly close your legs together, slowly lift them, hook up your toes and then slowly put them down. Be careful not to touch the ground when you put them down.

3. Supported by the third board, elbows are at 90 degrees to the ground, toes point to toes, and legs are close together. Don't collapse, keep the posture in the picture.

4, the fourth kind of supine knees and legs, palms down to the ground, legs together straight, thighs slowly raised, calves parallel to the ground, knees adducted, don't stick to the ground when straight.