Gym etiquette is the collection of agreements that bind us as a civilized social group. CFBT Etiquette #10: Please clean your equipment after every use – your DNA is not as desirable as you might think. Please wipe down all equipment after use, especially the pull-up bar and barbells. Should you bleed on anything in the gym, please discard the rag that you use to clean said equipment and notify the gym front desk.
We appreciate that you work so very hard to be a super functional human, but we do not require any samples of your awesome DNA.