For centuries, yogis, shamans and sages from different cultures have known the meaning of diaphragmatic or belly breathing. It became the basis for almost all meditation and relaxation techniques. With the advancement of Western medicine, understanding of anatomy and work of the nervous system, deep breathing became a central part in the treatment of autonomous nervous system (ANS) – related conditions, such as irritable bowel syndrome (IBS), anxiety disorders, and post-traumatic stress disorder