I’ve been approached at the gym before and don’t mind it as long as the guy is not being creepy (i.e., don’t stare at me doing sets). I’ve actually said yes to one and no to another. The one I said no to took it well and never came up to me again, which was good. Basically, if you do it, be respectful and don’t be a creep. Being approached isn’t the issue, it’s how guys handle the before & after (if they’re being rejected). Like if I say no and you keep staring at me and trying to converse on multiple occasions, that will start to creep me out. Or if you try to ask me out by following me to the water fountain or out the door towards my car, yes that will freak me out too or at the very least make me uncomfortable.