The "one" in "three, one and two" refers to adhering to one of the most basic qigong techniques, that is, practicing internal strength and leaving the abdomen. Specific practice: breathe along the abdomen, the abdomen bulges when inhaling, and the abdomen sinks when exhaling. Before going to bed and getting up in the morning, every time for 5 minutes, twice a day. Pay attention to eliminate distractions when doing it, and breathe deeply and long, with a frequency of 4 ~ 5 times per minute. This method can stimulate the nine meridians passing through the abdomen, make the various systems of the human body in a stable and balanced state, and also contribute to the regulation and sleep of the lungs.