During many hundred years Qigong became surrounded by many techniques, religious rites, stories, myths and even magic. From our point of view, if to clean qigong from philosophical-religious and also mystical layers, there is a simple and effective technique, based on laws of the human physiology. Just the development of the consciousness ability to affect physiological processes is the main and, in fact, single aim of all qigong practices. This book elucidates one of qigong aspects, namely its effect on such physiological process as energy synthesis by the human organism. The book explains from positions of modern physiology, why qigong breathing technique are such as they are. There is no place to mystic and religion. There are only physiological laws of our organism functioning.