This is hopefully the end of my list on gym offenders, but knowing gym goers, it probably isn't.

Offender 8: The Pack Hounds

Similar to the romantic couples that work out, these are the groups that work out together. Except "work out" is a generous term. There will be three or more dudes to one piece of equipment. One will be using the equipment and the others will stand off to the side or, worse, sit on another piece of equipment and not use it (that's an offense in and of itself!). I'm not even sure your cells are respirating.