This is an advanced form of Yoga called - Nauli bandha. To be practiced ONLY with the initiation of a trained Yoga Teacher/ Guru. I wish i was 10 years younger and performed a perfect nauli - but this is not bad! Please do not underestimate the effect of Nauli and Uddiyana bandha - it can help in digestion, fight against GERD, Gastritis. Some Yogis claim that Nauli awakens the Kundalini - the Serpent power lying dormant within us.
Google Video | January 29, 2007