Photo: Everett Collection

©DreamWorks/Courtesy Everett Collection

We've all had those moments in the gym where you notice something a little off about the dude lifting next to you. His shorts could be a little too tight, or he could be pulling some kind of Mickey Rourke style move, or maybe he's wearing a high-altitude training mask. Indoors. At sea-level. In short, we've all seen "that guy" and don't want to be "that guy." These are the moves to avoid.

A Flowy Tank Top

Tank tops and sleeveless T-shirts are completely appropriate in a fitness setting (and occasionally outside of it). But be careful here. You don't want to show too much cleavage, so keep an eye on how low the neck goes. If you feel like your pecs are exposed, you've gone too far--you shouldn't be dipping more than two or three inches past your clavicle, really. The same goes for your armholes. If your sides are exposed, buy another tank.

The Bulging Bulge

Support betwixt your legs is important from an efficiency and comfort perspective, but also an aesthetic one. The gym floor is not a place people come to see your twig and berries on display. So, if you look down and see a prominent bulge, invest in some Under Armour and lock it up.

The Midriff Show-er

Whatever you're wearing above the waist is going to move and stretch quite a bit during your workout. Nobody is going to give you crap if your midriff is slightly exposed when you're hanging from a pull-up bar, but you don't want to keep pulling it down the whole time. If you're bending over to stretch, you should be confident that you won't be plumber-butting the cardio wing.

The Not-So Great White Shirt

We understand that at times you're just scrounging around for the nearest T-shirt before you make your way to the gym in the morning. If it's possible, avoid white shirts when you're getting ready. You're about to clock-in for some serious sweat, and your treadmill companions aren't there to see what you'd look like in a wet T-shirt contest. Stick with darks.

Odor Assailant

A lot of guys just hit the gym in the morning, pre-shower. Think about that. You've got the previous day on you, whatever you did the night before, and a few hours of sleep to let it all sink in. Just a few streaks of deodorant under your arms will keep any lingering odors at bay. And sure, it's a gym, and you're meant to sweat, but it's also a shared space. Do your lifting buddy a favor.

The Shirt Lift

Just did an insane ab workout? That's awesome! But no matter how bad you feel that burn, there's no need to walk up to the mirror and casually lift up your shirt to check out your stomach--that screams narcissism. Leave that till you get back home.

The Fabio

Nobody cares about your hair.

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