Today, this ancient practice is being used in modern medical settings as an adjunct therapy for a wide array of ailments—from heart disease to hot flashes.  Hospitals are increasingly offering yoga classes for general wellness as well as classes designed for specific groups, such as breast cancer survivors, people with MS, heart patients and adolescents with eating disorders.  Some insurance companies are subsidizing participation, and a growing number of physicians are recommending the practice as a safe, inexpensive way to relieve stress and boost health—and sometimes avoid medications and surgery.