Let go of your stomach when inhaling, let it expand, and hold it tightly when exhaling. First of all, get used to this action, so you can do it at any time, which is very effective.

2. Draw 8 characters on the waist.

First push the waist to the left, then move forward, and then turn back to the right waist. The one on the right should also be forward and backward, just like drawing a horizontal "8". This is the eight-character method, which is very effective for the waist and abdomen.

sit-up

Insist on doing sit-ups around 10 every day, and add one every day after proficiency, which requires courage to persist.

4. Cycle method

You don't really ride a bike, but lie flat on the bed and lift your legs at night, moving in tandem, just like riding a bike. This is the cycle method.