For the past 6 months I've had a right shoulder problem that was pretty much a constant source of pain.  I've been to the doctor and taken prescription medication.  Upon returning home from my first yoga session I found there was no more pain and the arm now had the same flexibility of my left arm.  So, here I am two days later and still no pain.  I'm going back this Saturday for another session.  The yoga session was not the easiest 90 minutes of my life but it was sure worth the effort!