Or, the girl who is ratcheting up to 10 before she's good and ready — who looks frighteningly like she's about be flung off her treadmill at any moment.
One of our personal favorites is the guy or gal who, in a late-night sea of open treadmills, opts to use the one directly next to yours — basically challenging you to a weird, competitive treadmill race at a time when you didn't necessarily want one.
We've all come across these gym characters, and many more. Notice anyone at your gym with particularly annoying — or endearing — habits? Share with us in the comments, then head over to Pop Sugar to see them all illustrated as GIFs. (Pop Sugar)