Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Nauli is one of the Kriyas (1) or Shatkarma (cleaning exercises) from Yoga. The exercise is to serve the cleaning of the abdominal region - digesting organs, small intestine and is based on a massage of the internal belly organs by a circular movement of the abdominal muscles. Nauli is an exercise of the classical Hatha Yoga but is not taught often in yoga schools. Nauli is considered as a difficult exercise, which can be learned only with perseverance and patience. There are four different variations, which are gradually learned one after another.