1, body flat, legs raised and bent 90 degrees; Raise your arm vertically.

2. Lift your upper body while exhaling and let your shoulders leave the ground; Keep your abdomen tight, and then pause for two seconds.

3. While inhaling, slowly lower your body until your head touches the ground, so as to complete the whole action. Then repeat actions 2 and 3.

Do this action in three groups (ten times in one group), and then move on to the next action.

Swing arm half sit-ups;

1, lying flat on the ground, arms straight up; Legs together, knees bent, feet on the ground.

2, the upper body is raised, the waist should be close to the ground, just the shoulders should leave the ground; At the same time, the arms are extended to the knees; Doing exercises means breathing, and stop at the highest point for two seconds.

3. Inhale and slowly lower your body until your head touches the ground, thus completing the whole action. Then repeat actions 2 and 3.

Do this action in three groups (ten times in one group), and then move on to the next action.

Leg lifting exercises with elbow support;

1, keep your body in a semi-lying posture, with your elbows and palms on the ground and your legs together and straight.

2. Concentrate on the abdomen, lift your feet quickly with the strength of the abdomen instead of the strength of the legs, and exhale at the same time, and hold for two seconds after lifting your feet.

3. Inhale and slowly lower your feet until your legs are about to touch the ground. Then repeat actions 2 and 3.

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Do this action in three groups (ten times in one group), and then move on to the next action.