13 Wildest Obstacle Races Slideshow

13 Wildest Obstacle Races Slideshow

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When: 52 events year-round
Where: U.S., Canada, Europe, South Africa, Australia, New Zealand, Japan
If you’ve only heard of one race on this list, it's probably the Tough Mudder. Though longer (10-12 miles) and arguably more difficult than most mud runs, it's still one of the most popular, with roughly 500,000 people participating in 2012. Technically it's not a race, but masochistic competitors tend to treat it like one, attacking with abandon obstacles that incorporate ice baths, electrical shocks, fire and (obviously) lots and lots of mud. And then there’s the after party, where you can grab a beer and even a Tough Mudder tattoo.
toughmudder.com