There are two common methods of breathing exercises. One kind of breathing is mainly intercostal muscle movement, which is called chest breathing. One is called abdominal breathing, which can be divided into reverse abdominal breathing and forward abdominal breathing. Fitness qigong? 6? 1 six-character formula basically adopts the method of natural breathing in the whole set of exercises, but every time you exhale and exhale, you use the method of reverse abdominal breathing, that is, the lower abdomen is slightly adducted when inhaling, and the natural bulge is relaxed when exhaling. According to the traditional Qigong theory, when inhaling by reverse abdominal breathing, the "innate qi" in the body is lifted from the lower abdomen to the chest, and the "acquired clear qi" in nature is also sucked into the chest through the nostrils, so that the qi of the first and second days meets and merges in the chest. When exhaling, the turbid gas generated by the intersection is exhaled from the mouth, and the enriched gas still falls back to the lower abdomen. This is also a practice method in traditional qigong theory about the intersection of hurdle, fire, water and ridge, and the intersection of heart and kidney. The fitness effect is obvious, so what about fitness qigong? 6? The six-character formula of 1 should adopt reverse abdominal breathing when exhaling and exhaling.