Bro, are you serious?
Turn the treadmill up to 12 and stomp your feet as hard as you can to draw as much attention as possible. Run until you pass out and shoot off the back of the treadmill. If you're really lucky you'll fly into the girl you're interested in. If not though, you're still going to be surrounded by gym chicks when you wake up. Some will think you're an idiot, some will think you're brave, but either way, it's a great ice breaker.