Agnisar Kriya | Yoga para principiantes | Yoga For Menstrual Disorders & Tips | About Yoga in Spanish br br Agnisara Kriya is not strictly one of the 6 main Hatha Yoga Kriyas but is the preliminary practice for Nauli - churning of the stomach muscles. It's good to practice Agnisara Kriya for a few weeks to strengthen the abdominal muscles for the practice of Nauli.