12. Playing Loud Music
Not everyone appreciates death metal tunes. Yes, the iPods and the earphones are there for personal music enjoyment, but sometimes people bring their beatboxes and bluetooth speakers and blare out their favorite motivational song. What works for others may certainly not work for you, so why force people to listen? Adjust the volume and be considerate of others. The gym should be a place to work out and not have your eardrums shattered.