There are studies which show the benefits of yoga with managing fibromyalgia as well, and I almost critiqued one of those but chose tai chi because its something I would like to do more of. Yoga is definitely a similar mind-body medicine that employs physical activity and meditation and when I am practicing regularly my pain levels are extremely low and manageable. I have done tai chi in the past, and I wish I kept up with my practices because I forget most of the flows now :\ When I can afford to take a class, I'll definitely be doing it. For now, yoga it is ;)