Are there different methods in Hatha Yoga?

Yes but only one single method gives excellent medical results. Only one method is an optimum clinical technique. So we need to understand this without feeling let down by our methods we follow. The human body is very precise and needs such an understanding. For e.g. heating the room to exercise is physiologically very unhealthy for the body beyond a point. There are many such instances but unless one understands human physiology its not possible to see the subtlelities of exercise physiology.