Exhale refers to exhaling the turbid air in the chest from the mouth, and then slowly inhaling fresh air through the nose. See "Zhuangzi Deliberately": "Take a breath and spit out the old and get new." In other words, spit out the polluted air and breathe clean air. Seven Records of Yun Qi (Volume 32) Treating Diseases with Qi says: "All qi is inhaled through the nose and exhaled through the mouth. Slightly cited, it is called long interest. Internal qi one, external qi six. Internal qi sucks both. Exhale six, that is, blowing, shouting, hey, oh, shush and whimper, are all venting. Mortal breath, breath, without this number, want to be a long breath. The method of exhaling can be blown in cold weather, shouted in warm weather, and cured. Blow to get rid of heat, shout to get rid of wind, hey to get rid of annoyance, oh to get angry, and shush to get rid of gas, which is extremely slow. " In other words, if you breathe anger and vomit to death, you will live forever.
Breathing in and out is a method of refining qi in qigong, which means breathing, and breathing includes external breathing and internal breathing. External respiration refers to the gas exchange between outside air and lung blood, also known as lung respiration. The so-called internal respiration is the gas exchange between blood and tissue cells, also known as tissue respiration. The breathing of qigong is mainly to adjust the breathing of the lungs, so that it can reach the level of uniformity, fineness and depth described by the ancients as "be careful when you spit, and keep on receiving". So as to have a good influence on internal breathing. It is said that breathing exercises are for beginners. When breathing exercises reach a high level, they are interest-free and adjustable. At that time, breathing was slight, suddenly interrupted and entered the realm of fetal interest. <