To be in Yoga means to experience the oneness of existence.  

The only way to experience true wellbeing is to turn inward. This is what yoga means - not up, not out, but in. The only way out is in.

Hatha Yoga is not body-bending business. It is about taking charge of the way you think, feel, and perceive life.

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.

Your brain need not deteriorate with age. With simple yoga practices, you can keep enhancing it.