Exhale when the abdomen is closed and inhale when you return. When you roll your belly, your body will squeeze inward, and your chest will also squeeze and contract. At this time, you have to exhale. When you return to your position, your chest will swell when you let go. At this time, you will inhale.

Extended data:

first step

1, flat abdomen, lying flat on the ground, knees bent 90, feet flat on the ground. Cross your hands on your chest or beside your ears, sink your shoulders and abdomen, and press your jaw slightly down until your shoulder blades leave the ground and your waist is fixed. Then press your shoulder blades down to the ground, exhale upwards and inhale downwards, one up and one down.

Second step

2. Lift your legs and abdomen, lie flat on the ground, bend your legs and lift them, and your calves are parallel to the ground. The action is the same as above

Third step

3, low leg lift and belly roll, the same as leg lift and belly roll, but the leg remains suspended after being put down, a few inches from the ground.

One group 15 to 25, each group has a rest time of 20 seconds to 30 seconds and exercises more than four times a week. It is difficult to persist at first, so you must not be lazy. You must do it strictly according to the action requirements, even if you stop a little.

Every stage of the movement should be unfamiliar to skilled, about a month and a half, the abdomen will become quite tight. If you add 40-50 minutes of jogging every day, the "general's belly" will naturally disappear.

References:

Baidu encyclopedia, roll your stomach