Yoga is the science of entire creation. Sun, moon, earth, water, sky, fire as well as human body are various aspects of creation, yoga is the sum total of it all. What is the force that powers the various aspects of creation, that makes them function, that is the subject of yoga. When you do yoga under a guru, you start interacting with these various elements and forces and slowly you become one with them. Take for instance the five elements. We know the body is made up of the five elements, yet we cannot see them. As you do higher practices of yoga, you begin to realize all these in your body and understand their basis. Then the elements listen to you and follow you. You are able to interact with them and affect changes in the body using them. The science of yoga unfolds in stages, first through elements, then consciousness and finally, divinity. Yoga is often mistaken as a healing system of the body. Actually, it is not a healing science, it is the sum total of yam, niyam...