'checking out chicks' makes you 'the creepy guy'.
99.9% of women go to the gym for the same reasons you or I go to the gym, to train and then get the fuck out.
the ones who actually WANT to be checked out, are the ones you'd want nothing to do with.
the other's will always see you looking at other women, even if they don't catch you checking at them, and they'll think you're 'that creepy guy'.
3/4's of my clients are women, and I'm in the gym 10-14hrs a day, so I hear about this shit daily.