With each breath a wave can be seen to ascend and descend through the body. The inspiratory wave begins deep in the abdomen with a backward movement of the pelvis. This allows the belly to expand outward. The wave then moves upward as the rest of the body expands. The head moves very slightly forward to suck in the air while the nostrils dilate or the mouth opens. The expiratory wave begins in the upper part of the body and moves downward: the head drops back, the chest and abdomen collapse, and the pelvis rocks forward.
Breathing easily and fully is one of the basic pleasures of being alive.
― Alexander Lowen, The Voice of the Body