Stand in front of the wall, with your body about 0/0 cm away from the wall, and let your chest, abdomen and waist stick to the wall in turn. Note: when the chest sticks to the wall, the waist leaves, when the abdomen sticks to the wall, the chest leaves, and when the waist sticks to the wall, the abdomen leaves. After practicing many times, you can even sit and move whenever you want-and you don't have to move anywhere except your stomach.