The first step is to sit in a chair and slowly lift your legs.

The second step is to put your hands gently on your lower abdomen and exhale slowly. While exhaling, gradually tighten the lower abdomen.

The third step is to exhale slowly, the lower abdomen is getting tighter and tighter, and the shoulders are kept relaxed.

The fourth step, when the abdomen has been the tightest, the gas is also spit out.

Step 5: After the shoulders and lower abdomen are relaxed, slowly start inhaling.