Spandex for women is a must

Don't give up after the first push up? Lolz

Always wipe your sweat off of the machine when you're done.
This seems to be a very difficult task for some😒

Avoid doing squats in front of a guy , just saying.

Shave under arms

take 2 towels
one to sit on

The mirrors are to check your form as you do the exercises, not necessarily to admire yourself in.

Unload the free weights after you are done using them (typically leg exercises)

Sweating is expected, stink is offensive.

Someone else pointed out wiping down the machine afterwards - especially if you are ill.

Don't monopolize a machine.

Not everyone will do these, so don't be shocked to not see them being done.