First, eliminate abdominal fat and tighten abdominal muscles.

Sit in a chair with your body and thighs at 90 degrees and your back straight. Put your hands on your thighs and grab the edge of the chair. Exert your stomach, count to five slowly, and try to lift your knees to your chest. Pause at the highest point, and then slowly put down your body at a speed of slowly counting to five. The effect of this action can eliminate abdominal fat and tighten abdominal muscles. But be careful, your hands don't need to be hard, just put them on your thighs easily. Moreover, the body can't lean on the back of the chair, and you must be able to clearly feel the stomach exerting force. Do what you can, but it's best to do it at least continuously every time.

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