2, lie on your back, put your arms straight beside you, and relax the anus.

3, lie on your back, put your arms straight beside you, and lift your legs at the same time in turn, at right angles to your body.

4. Lie on your back, relax your hips and legs, bend slightly apart, put your feet on the bed, and try to raise your hips and back.

5. Sit-ups.

6, kneeling posture, knees apart, shoulders and elbows vertical, hands flat on the bed, waist turning left and right.

7, kneeling posture, arms supported on the bed, left and right legs alternately raised to the back.