Going to the gym is one of those strange environments where you interact with lots and lots of people in very close proximity, but you don't say a single world to them.
However, a lot of the time you wish that you could because people do a lot of weird stuff in the gym that is completely unnecessary. From grunting incredibly loudly to doing that weird exercise where they have their legs all over the place, sometimes you just wish you could say some of the following things to them.
But you can't, of course....