Fitness feats have been well documented over time, starting with Eugen Sandow posing in 1903 (above). YouTube offers newbies and veterans the chance to show off their stuff, so we combed through the vast black hole of the site to find the some of the most jaw-dropping acts of athleticism. Whether you look up (or look down) to these dedicated guys (and gal) is up to you.

The Game Changers >>>

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DEADLIFTING... TIRES?

There's something frightening about the deadlift––some people call it the truest test of strength. Next time you're in the gym, screw the plates. Real men lift truck tires.

The Well-Rounded Workout Routine >>>

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ANYWHERE WORKOUT

Apparently you just need a stable core and a playground to get an insane workout. Though behind-the-back pullups look rather uncomfortable, there's no way you could call this guy out of shape.

5 Ridiculously Easy Tequila Recipes >>>

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YES, A 13-YEAR-OLD GIRL CAN OUT-BENCH YOU.

Russian tween Maryana Naumova eats grizzlies for lunch, we've heard. Can't say from whom. But she's nasty strong, as evidenced here:

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FREEWHEELIN'

We can't really recommend this to anyone, but if you're trying to get into parkour, this might provide some inspiration. And please be careful. Truns out, concrete is hard on the body.

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BEST PSA FOR A PREWORKOUT MEAL

Curling can take a lot out of you, admittedly. This young man reached a new feat of fitness, one we'd hardly ever seen in the gym: flat-out fainting after the first rep.

Double Duty Arm Workout >>>