Aerobics abdominal swing back and forth is a common abdominal exercise method, which can help burn abdominal fat and strengthen abdominal muscles. Here are the steps to swing the abdomen back and forth:

1. Preparation posture: stand or sit down, keep your back straight, and keep your feet shoulder-width apart. You can put your hands on your hips or thighs and keep them stable.

2. Swing forward: inhale, tighten the abdominal muscles, and then swing the trunk forward as far as possible, so that the chest is as close to the thigh as possible. This action is similar to "swinging", but be careful not to use the strength of the waist to help complete the action.

3. Return to the original position: exhale and slowly restore the trunk to the starting position. Repeat this action 8- 12 times.

4. Swing backwards: inhale, tighten the abdominal muscles, and then swing the trunk backwards as far as possible, so that the chest is as close to the thigh as possible. This action is similar to "swinging", but be careful not to use the strength of the waist to help complete the action.

5. Return to the original position: exhale and slowly restore the trunk to the starting position. Repeat this action 8- 12 times.

Precautions:

1. When swinging the abdomen back and forth, keep breathing smoothly and don't hold your breath.

2. Move slowly and steadily, and avoid overexertion to avoid injury.

If you feel unwell, you should stop exercising immediately and seek the doctor's advice.