1. Don't ask someone if they're done with a machine while they're literally still sitting on and using it
2. Return your weights from whence they came.
3. Don't block the mirrors. Men are having staring contests with themselves.
4. Wipe up after yourself.
5. Don't use your phone in the restroom (this applies outside the gym as well)
6. Don't start a conversation with someone while they're doing Cardio
Okay, no one except for Rachel McAdams
7. Shut your locker doors when you're finished
They get in the way of other patrons and need to be shut at the end of the day by the employees. It's just another thing you're adding to their list of things to do before they go home