I've been going to the Bikram Studiio in Williamsville for a couple of years. It's "hot yoga" distinguished by practicing a prescribed set of hatha yoga positions in a 105 degree room. It's a more intense workout in the heat and helps facilitate muscle flexability. The sweating is great for the skin.
If hot yoga is not for you, I also heard good things about the instructor at Rising Sun Yoga Studio in Snyder.