What people shouldn't do in a gym?

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Hey everybody, I have been watching some people in the gyum lately and some attitudes and behaviours are unacceptable or just really annoying. I need you help to dress the most complete list of the worst things people can do in a gym. Here is one for beggining: 1- Smell like crap. Wearing deo is not that hard... Washing isn't either, I understand that exercising makes you sweat, but not to the point that you smell like a dead cow. Here, your turn.