These are purification processes usually classified into six dicisions and
therefore they are often called 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, orocranial, gastroaesophageal, anorectal and intestinal.