a. Exhale stage: at the beginning, exhale slowly, and push the gas out of the abdominal cavity by contracting the abdomen until the gas is exhausted, the process is about 5 seconds.<br>b. Breath holding stage: stop breathing after exhaling and hold for about 2-3 seconds.<br>c. Inspiratory stage: first relax the ribs, let the air slowly fill the chest to maximize the expansion of the chest, then continue to inhale, relax the abdomen, so that the abdomen gradually bulges, inspiratory time is about 5 seconds.<br>
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