Having been born in india, we did do some hatha yoga. The word yoga in sanskrit means somewhat loosely translated to joining. It joins the mind and the body. Personally its a great supplement to exercise, because it keeps you supple in your body as well as in your mind. If done with the right attitude it can be beneficial because it develops focus and concentration to parts of your body which at first might not be willing to bend or stretch in that particular way, however in the course of time and practice the body gets used to it and you learn how to continuously push yourself steadily and you can see formative improvements as the days go by.