The term "Power Yoga" came into common usage in the mid 1990s, when
several great American yoga teachers like David Williams, David Swenson,
Bryan Kest, Nancy Gilgoff, Norman Allen and Beryl Bender Birch were
looking for a way to make Ashtanga yoga more accessible to western
students. Everybody from athletes to health advocates, editors to
celebrities (including Madonna and Sting - it´s big with the one-name
crowd) embrace Power Yoga.