Yoga is the most powerful force in the world," according to Iyengar, the most renowned yoga master to emerge from India in this century. Here he relates the practical benefits of yoga as a healing art. Intense, energetic and articulate, Iyengar's presence belies his sixty-six years at the time of this interview. He describes himself as "liquid hot iron," and provides considerable evidence to support the benefits of yoga practice in this conversation. Not to be missed if you want to expand your spiritual horizons.