i'm alan rosenberg.u been to the doctor lately because you pulled something or because what used to hurt a little now hurts a lot? well, you're not alone. baby boomers are falling apart, but we can't stop exercising, right, because that's bad for us? and modern medicine can fix anything, right? well, maybe not. here's how one dedicated runner is dealing with the baffling contradictions. my name is john hobby. i'm an attorney in brooklyn, new york, and i'm 50 years old. (man laughs) how does that make you feel? ooold! growing up, i played lots of different sports. i played a lot of basketball. i played baseball and football. for the most part now, i run long distances, usually 2 or 3 times a week, i do some weight training 3 or 4 times a week, and whenever i can, i get out on my bicycle. when i can't get to working out, whether it be weight training, running; i feel bloated, i feel grumpy, and i feel like i'm missing something. there is a sort of broad cultural trend to feeling that you shouldn't be held