These are the purification processes usually classified into six divisions and therefore they are called as SHATKRIYAS. These are Dhauti, Basti, Neti, Trataka, Nauli, and Kapalbhati, each one of which consist of many subsections. They increase the range of adaptability of the tissues forming various organs and systems and raise the threshold of their reactivity. Kriyas bring control on different reflexes and establish psychophysiological balance. The modes of purification in the kriyas are air, water, friction, and manipulating movements. The regions of cleansing involved in various kriyas are Nasopharyngeal, holocranial, gastroesophageal, anorectal and intestinal.