Bhastrikā (pronounced bha-STRI-kaah), is an important breath exercise in yoga and pranayama. It is sometimes treated as a kriya or 'cleansing action' along with kapalabhati to clear the airways in preparation for other pranayama techniques. Bhastrika involves a rapid and forceful process of inhalation and exhalation powered by the movement of the diaphragm. The movement of air is accompanied by an audible sound. One inhale and exhale equals one round of bhastrika, and it may be repeated for many consecutive rounds. B. K. S. Iyengar explains that the similar "process or kriyā of kapālabhāti is a milder form of Bhastrikā Prāṇāyāma. Swami Sivananda describes the process: "inhale and exhale quickly ten times like the bellows of the blacksmith. Constantly dilate and contract. When you practise