Yeah - a 6 -pack is nice, but a guy who is obsessed with his own body and won't eat anything fun is kind of a turn off. I'd love to meet a guy at the gym who is moderately into working out but not obsessive. I've never actually met a date at the gym though, although maybe once or twice a guy has said something flirtatious to me. I tend to go into my own "cone of silence" though when working out so I probably have missed some signals.
Crazy ex-BF was the only BF who ever went to the gym with me - I liked that. We didn't always do the same kind of workout but we would go together. When I would do a water exercise class, he would stand at the upstairs window and wave to me and make goofy faces - all the women in the class thought that was great because he was very handsome and looked like an athlete. (Too bad it turned out he was crazy and duplicitous!). Eventually I'd like to get back to working out in the gym instead of at home, maybe I need to pay more attention to the guys around me in the future.