Yoga is everywhere among the affluent and the educated. The bending, stretching, and deep breathing have become a kind of oxygen for the modern soul, as a tour of the neighborhood shows rather quickly. New condo developments feature yoga studios as perks. Cruise ships tout the accomplishments of their yoga instructors, as do tropical resorts. Senior centers and children’s museums offer the stretching as a fringe benefit—Hey, parents, fitness can be fun.
Hollywood stars and professional athletes swear by it. Doctors prescribe it for natural healing. Hospitals run beginner classes, as do many high...