Take a supine or comfortable meditative sitting position or lie on your back and relax your whole body. Observe natural breathing for a period of time. Place the right hand on the belly button of the abdomen and the left hand on the chest. When you inhale, expand your abdomen outward to the greatest extent possible, keeping your chest still. When exhaling, contract the abdomen inward to the maximum extent possible, keeping the chest still. Keep the rhythm of each breath consistent. Carefully experience the rise and fall of the abdomen. After a period of practice, you can remove your hands and just focus on the breathing process with awareness. When breathing in, feel the breath start to pass through the nasal cavity, throat hazel fully concentrated in the lungs, when the lung volume gradually increases, while keeping the thorax immobile, it will force the diaphragm to sink, while the abdomen slightly bulges outward; exhale to retract the abdomen inward, the diaphragm lifts upward, so that a large amount of turbid air is exhaled out of the body Exhale to retract the abdomen and lift the diaphragm upward, so that a large amount of turbid air is exhaled from the body. Take the abdomen as a ball, inhale through the nose to make the abdomen bulge, slightly stop for a second or two and then exhale through the mouth to the abdominal wall sink. There are about five or six times per minute. Generally twice a day, in the city, at 10 a.m. and 4 p.m., for about 10 minutes each time. The key to abdominal breathing is: either inhale or exhale to try to reach the “limit” of the amount, that is, inhale to can no longer inhale, exhale to can no longer exhale for the degree; the same reason, the abdomen should also be corresponding contraction and expansion to the extreme, if each breath directly to the lower Dantian is better. Practice abdominal breathing is generally used for health care, because the amount of oxygen inhaled is two to three times higher than normal, so it can also be used to treat diseases in various parts of the body’s internal organs. For example, if you have a headache, you can inhale a full breath and suddenly take your heel off the ground, forcing the gas to go straight to your head and then exhale.