Well, that is not what is yoga in India as I learned. The physical aspect of yoga is a rather small part. Most Indians are not doing that kind of yoga. That would be like expecting all Muslims to do the Derwish dance. The interesting thing is that yoga seems to be re-introduced to India through the Westerners traveling there. Originaly the physical or Hatha Yoga was a preparation for those seeking the spiritual path and enlightenment, preparing their body to be able to sit quietly for hours. Actually most people here in the West do Yoga for the side effects and not it's original purpose. At least at the beginning.