That being said, people are usually friendly at the gym, and you shouldn't let their headphones and sweat intimidate you (though maybe don't try to talk to them if they're still wearing those headphones). Here are a few clever ideas for one-liners that can totally work in a workout class — no locker room talk involved. These aren't sure-fire wins for every single person you might encounter at the gym, but they may at least spark some ideas.