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.
These athletic acts are something to aspire to. Or maybe ignore.