telling a newbie about the benefits of yoga, you might find that explanations like "It increases the flow of prana" or "It brings energy up your spine" fall on deaf or skeptical ears.As it happens, Western science is starting to provide some concrete clues as to how yoga works to improve health, heal aches and pains, and keep sickness at bay. Once you understand them, you'll have even more motivation to step onto your mat, and you probably won't feel so tongue-tied the next time someone wants Western proof.I myself have experienced yoga's healing power in a very real way. Weeks before a trip to India in 2002 to investigate yoga therapy, I developed numbness and tingling in my right hand. After first considering scary things like a brain tumor and multiple sclerosis, I figured out that the cause of the symptoms was thoracic outlet syndrome, a nerve blockage in my neck and chest.Despite the uncomfortable symptoms, I realized how useful my condition could be during my trip. While visiting various yoga therapy centers, I would submit myself for evaluation and treatment by the various experts I'd arranged to observe. I could try their suggestions and see what worked for me. While this wasn't exactly a controlled scientific experiment, I knew that such hands-on learning could teach me things I might not otherwise understand