Apana Prana influences the lower part of the body from the navel to the soles of the feet. This Prana governs the abdominal region, below the naval region & provides energy for the large intestine, kidneys, anus & genitals. It is concerned with the expulsion of waste from the body & is the force which expels the breath.  Diseases that affect the lower abdomen, intestines, kidneys, urinary tract, legs, etc., are the result of disturbed Apana Prana. The techniques of Nauli, Agnisara Kriya, Ashvini Mudra and Mula Bandha serve to strengthen and purify Apana Prana.