Just walk up to her like you fuckin run the place and tell her that she is the most beautiful creature that you have ever laid eyes on then walk off. And the next time you go to the gym don't make a big deal about it. If she approaches you in the future at some point even for a bullshit reason then you are as good as mounted up, I she doesn't then she'll just think your a nice guy with balls and she'll tell her friends about it and one of them might wonder why you don't think they are the most beautiful creature. Shit like that has worked in the past believe it or not.
Nothing wrong with wanting to fuck someone like that, I've wanted to fuck Dallas Rain forever but we can't seems to schedule up.