dr. loren fishman has been practicing medicine and yoga for over 40 years. he's also written 10 best-selling books on the healing powers of yoga. - dr fishman, tell me what the medical benefits of yoga are. what does it work for? - oh, it works for so many things. low pack pain, which afflicts 80% of america. improves the strength of bones, reduces the pain of arthritis. eases the transition that menopause presents. depression, insomnia, i'm just skimming the surface of some of the more dramatic ones. yoga's good for so many other things. aches and pains. the nameless maladies that effect everybody every year. - for someone who's never done yoga before, do you think, doctor, that the 3 week yoga retreat is a good way to get started? - the 3 week yoga retreat is so good, because you first get good instruction. it's not glamorized. rather, it's made practical. secondly, in itself, it has some power to actually improve you. to help you lose weight, to help you get more fit, to improve your balance and your posture, and such things. and third, i think it is a wo