Beryl Bender Birch is the bestselling author of Power Yoga and the Director of The Hard & The Soft Astanga Yoga Institute (since 1981). She is also the Wellness Director and Yoga T...ver másBeryl Bender Birch is the bestselling author of Power Yoga and the Director of The Hard & The Soft Astanga Yoga Institute (since 1981). She is also the Wellness Director and Yoga Teacher-in-Residence of the New York Road Runners Club. She is one of the most highly regarded and well-known yoga teachers in the United States.ver menos