I've been burned one too many times with girls and their bodies, whether they're just plain insecure or actually have some weird roll or nasty cellulite they hide until the last possible moment - so, I'm finding the gym to be a good place to get a good look at these girls without spending a dime. And, to determine how comfortable they are with their bodies by what they're wearing at the gym.
I just got out of a relationship, so I want to make sure that the next few girls that I date aren't a complete waste of time (if I can help it). I don't want to even go out to dinner with an average girl, or get drinks with a girl who's insecure about her body. I don't even want just the same ol' type of sex, I can call other girls up for that.
There's someone else who mentioned that they'd probably meet a girl they were going to marry at the gym, and although I'm not looking to get married, I definitely see the benefit in meeting girls here (from a pre-qualification stand point). Again, I'm also not in the mood to date for the sake of dating, I want something pretty specific.
Here's my problem, and it's similar to yours, I'm not always so sure how to open them. Gyms aren't exactly places I want to crash and burn in, from a pick up perspective, because the main reason I go to the gym is to get fit (it's business). But I do want to start meeting some girls there for the reasons I stated above. The last girl I did talk to looked much better from afar, so I'm glad I wasn't very aggressive initially, because that would have been bad since she was really responsive. And I think that's key, since it's practically implied that most guys are sleezy in gyms, that you really have to work conversations in casually while not being socially awkward.
Sure, the case can be made that you should always be pretty aggressive, not afraid to show your intentions, etc., but I prefer a more subtle approach since I'm not ugly and I'm certainly not socially awkward.
I think that speaks to a broader question, of a more hollistic approach to how you view yourself and your potential-self, and how that relates to you in the context of gym approaches. I've thought about, and have logically sounded out, my reasons for approaching girls in the gym the way I want to. If you're a complete noob to the game, you're not going to have the self-awareness to understand why you may not want to do something or another in any given particular situation, but that's OK. You can develop that with experience.
Fortunately for me, I have a 24 hour fitness membership and I can work out at multiple clubs and a whole other membership to smaller private gym.
Also, it helps to note that at the gym, or at the beach, your goods are much more on display, and girls are very much aware of how fit you may or not be, and it will ALWAYS help your game if you're in better shape than not. So keep in mind that the primary reason you're there is to get in better shape and look and feel good about yourself. I'm not completely happy with my body so I'm working on it.