Yoga is now part of the zeitgeist of most Western societies just as these societies are undergoing tremendous challenges to advances in health, wellbeing, and life expectancy. Amid fast paced lives and increasing socio-economic pressure, stress is a leading cause of illness and a leading motivator for doing yoga. We also live in a global environment beset by rapid climate change, resistant infectious organisms, and social dislocation and alienation that reflect and are exacerbated by the very globalizations in which most of us actively participate. Yet human beings are naturally healthy. According to the World Health Organization, being healthy means “a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.” The alternative definition given by Andrew Weil, M.D...