Nauli is one of the kriyas or shatkarmas, preliminary purifications, used in yoga. The exercise is claimed to serve the cleaning of the abdominal region - digestive organs, small intestine- and is based on a massage of the internal belly organs by a circular movement of the abdominal muscles.[2][1] It is performed standing with the feet apart and the knees bent.[3]

The 15th century Hatha Yoga Pradipika claims that Nauli (magically) removes all diseases.[1]

Nauli is an exercise of classical hatha yoga;[1] it is not often taught in yoga as exercise. There are four steps, which are learned one after another:[4]