For some people, a triathlon is a joyous event. These super-humans can run faster than you, swim faster than you, bike faster than you. They're fit in a way you can't imagine, as you sit on your couch, remote control in hand, ready to surf the channels. You like watching these people. Of course, television recognized this long ago and started pitting the fit against each other in competitions like American Ninja Warrior.

Because everyone likes to watch, we've found The 15 Most Intense Physical Challenges on Reality TV Show Competitions. There's mud, electricity, rabid dogs, and models ahead—don't hurt yourself adjusting the settings on the computer.

Written by Valeriya Safronova (@vsaffron)

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