Breathwork

Breathwork is a New Age term for various breathing practices in which the conscious control of breathing is said to influence a person's mental, emotional or physical state, with a claimed therapeutic effect. There is limited evidence that breathwork may be helpful for relaxation and stress, though no other health benefits have been proven. Breathwork can cause distress.
Description and sub-types.
Breathwork is a method of breath control that is meant to give rise to altered states of consciousness, and to have an effect on physical and mental well-being. Derived from various spiritual and pre-scientific traditions from around the world, it was pioneered in the West by Wilhelm Reich. 
There are several sub-types of breathwork: