How about going up to a nice dime piece and ask her if she wants to run through a really good ab routine. Just make sure it involves no machines just lying on the ground doing bicycle kicks and crunches and shit. If she says yes then cool or if she says no or tells you she has a bf just say in a snotty way that you are not interested in dating her you were just looking for an ab workout buddy. Win win situation. Either you get her or get to own her!