Even doctors need medical help once in a while, and that's how Dr. Richard Usatine discovered yoga. The former UCLA medical school professor suffered a back injury in a car accident. After a year of failed attempts to get rid of the pain, Usatine was willing to try anything. He went to see a friend and colleague who specialized in physical medicine. The prescription came as a surprise. Try yoga, the friend said. Yoga worked so well that Usatine now recommends the ancient practice to patients who complain about stress-related conditions. He also researched yoga and its potential benefits for 20 health conditions in a book called "Yoga Rx." The book, which recommends yoga for a range of problems from asthma to back pain to irritable bowel syndrome, was published last year with yoga therapist Larry Payne. Los Angeles Daily News