Yoga is practiced by many millions of people worldwide and is celebrated for its mental, physical, and spiritual benefits. And yet, as Daniel Simpson reveals in , much of what is said about yoga is misleading. For example, the word “yoga” does not always mean union. In fact, in perhaps the discipline’s most famous text—the Yoga Sutra of Patanjali—its aim is described as separation: isolating consciousness from everything else. And yoga is not five thousand years old, as is commonly claimed; the earliest evidence of practice dates back about twenty-five hundred years. (Yoga may well be older, but no one can prove it.) is a clear, concise, and accessible handbook for the lay reader that draws upon abundant recent scholarship. It outlines these new findings with practitioners in mind, highlighting ways to keep traditions alive in the twenty-first century.