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    Tough Mudder events are 10- to 12-mile obstacle course challenges that test all-around strength, stamina and mental grit.
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    More than half-a-million people have participated worldwide and raised more than $3 million for the Wounded Warrior Project.
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    On average, only 78 percent of participants complete a Tough Mudder challenge.
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    Participants leap off a platform in the Walk the Plank obstacle.
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    Racers crawl under live wires in the Electric Eel obstacle in Toronto.
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    Crawling through the dirt in Kiss of Mud.
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    Wetting down the course.
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    A team poses during Tough Mudder Toronto.
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    Climbing the Spider's Web.
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    Competitor Nicole Bahn.
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    Getting a haircut.
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    Jason Capiello, Tomas Molfino, Lucas Rooney, and Anson Felder rock the schoolboy punk look.
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    Read more about Tough Mudder and the other top obstacle courses in the November issue of Outside.
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