I've found that some chicks go to the gym to workout and not talk to anybody (headphones on, Girlfriend mag in front of their cardio machine), other chicks love to go and be noticed and perved at, but then pretend to be indignant if you stare at their arse too much (the lululemon wearing, leggings, and full on makeup), noting that most of their exertion is spent txting on their iphones in between sets of 1kg dumbell half repper curls. I have yet to know of a chick who goes to the gym wanting or anticipating an actual pickup from a sweaty, hulky (eg intimidating) bloke. It just comes across as sleazy. You'd have a far better chance by joining a class with a high F:M ratio (eg yoga, pilates, threadweaving) or hit up a boozed up sloot in a club playing remixes of One Direction.