[actuator]

Can't answer for Indians, but as far I understand it is a bit complicated. Depending on the classification you are looking at there are like 6-8 branches of Yoga of which "Hatha Yoga" is one. Hatha Yoga is the one which most people think of as Yoga. It has the physical 'asanas' as the main component. It has other parts like 'Pranayam' as well which are breathing exercises with chanting of verses/sounds in some of them. Most people who practice yoga are doing 'asanas' primarily with 'pranayams' mixed in sometimes. 'Asanas' in themselves are mostly physical and I think anyone can do them without any context. So, feel free to do so. :)