An active and athletic style of yoga adapted from the traditional ashtanga system in the late '80s to appeal to aerobic-crazed Westerners. After having studied with Pattabhi Jois, Beryl Bender Birch and Bryan Kest simultaneously pioneered this westernized ashtanga on the East and West coasts, respectively. Power yoga doesn't stick to the same sequence of poses each time like ashtanga does, so the style varies depending on the teacher. Classes called "vinyasa" or "flow" in your gym or studio can be vastly different but, in general, stem from this movement and from ashtanga as well.