mugs

your right...Hatha Yoga,Yana Yoga,...

RAJA YOGA,(meaning "Royal Yoga") is a psychological,physical,spiritual thing..it is on an esoteric level..it is a science!Which is relevant to today as it many years ago.

a good book.The Science of Yoga(I.K Taimni)..available at Amazon which deals with the Yoga Sutras..in a lot of depth!!

Hinduism is separate from Yoga..but they are related

Nirvana is a buddhist thing