I just like to wait for babely dudes to be anywhere near the squat rack, and then just VOLUNTEER to spot them. Only one of three things can happen:
1) dude says "yes, thanks" and then I attempt to flirt. Because let's face it- if you're letting some broad spot you at the gym on a squat, even if she's KINDA jacked, you're still probably just not squatting that much and you know it. No dudes who are serious about their squats are letting me spot them EVER. You saying yes = I'm going to treat you like I just bought you.
2) dude says "no, thanks," but continues talking to me for some reason. This signifies that chatting up the girl is more important than squatting...which means I am SO in, and when is our first date?
3) dude says "no, thanks," and then goes about his business, which means I'm definitely not in, but since I was smart enough to volunteer for what could be a legitimate favor, I don't have to be super embarrassed for being rejected. I will probably never make eye contact with the dude again, but at least HE doesn't know how embarrassed I am.
So I pretty much can't lose.