There exists a great variety of fields and professionals, who use breathing as fundamental tool in their work. In the last five decades, research projects about breathing in western countries have focused on lungs’ diseases or illnesses of the breathing apparatus, rather than on the mechanics of breathing, on the interactions between the psychological and physiological aspects of the breathing mechanics, or on the spiritual aspect of breathing. For thousands of years in the east, research in the field of the science of breathing has been carried out and implemented. But in the last decades, this research has increased in psychotherapy, in psycho-spiritual development practices, and in breathing mechanics. The disciplines in which breathing is present as fundamental tool are manifold and varied in their objectives: diagnosis and treatment; physical, emotional, psychological and spiritual health; different fields that use breathing as therapy with diverse ways of applying it in order to reach states of expanded awareness. Professionals employing breathing as main tool in their work speak about physical, emotional, psychological, spiritual healing. Nevertheless, very few [...]