Simultaneously celebrated as a 5,000-year old spiritual practice and booming $10 billion "industry," yoga today is a strange mix of fitness, therapy, mysticism, and commercialism. In Yoga Ph.D., political science professor-turned-yoga teacher Carol Horton presents a fresh take on how to understand - and work fruitfully with - this strangely paradoxical and surprisingly popular practice, which is being actively pursued by over 20 million Americans...