When most people consider the idea of teaching Yoga, they usually perceive the superficial physical requirements of a Hatha Yoga instructor. There are many styles of Yoga, and Hatha Yoga is just one of them. In fact, within the sub-styles of Hatha Yoga, there are a number of "gentle" styles. So, being really flexible, young, and having the body of a super model, are not required in order to teach Yoga.