Don’t carry your gym bag or personal belongings with you on the gym floor. Use the locker room or coat check. They present a hazard for moving people. Don’t offer unsolicited advice. Unless you are a personal trainer, it is not your responsibility to give others advice on how to use the equipment. If they ask you, and you are sure you know how to use the equipment, it’s okay to help them. Don’t treat the locker room like your personal bathroom. Pick up your used towels and place them in the bins intended for them, and throw away any trash in the waste cans.