What hatha yoga does is, if you consciously hold the body in an asna, it can alter the way you think and feel and experience life.

Kriya Yoga requires nothing but dedication towards the practice. As you refine your energies, there is no way you can remain untransformed.

What we refer to as Yoga is a technology to make your energies function by choice, not by compulsion or fixed patterns.

Jesus said, "The kingdom of God is within you." Yoga is about experiencing it.

Most of the Yogic practices work on the energy body, because if your energy body is in full vibrance and proper balance, physical and mental health will happen naturally.