“It is a common belief that we breathe with our lungs alone, but in point of fact, the work of breathing is done by the whole body. The lungs play a passive role in the respiratory process. Their expansion is produced by an enlargement, mostly downward, of the thoracic cavity and they collapse when that cavity is reduced. Proper breathing involves the muscles of the head, neck, thorax, and abdomen. It can be shown that chronic tension in any part of the body's musculature int