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  • Tough Mudder events are 10- to 12-mile obstacle course challenges that test all-around strength, stamina and mental grit.

  • More than half-a-million people have participated worldwide and raised more than $3 million for the Wounded Warrior Project.

  • On average, only 78 percent of participants complete a Tough Mudder challenge.

  • Participants leap off a platform in the Walk the Plank obstacle.

  • Racers crawl under live wires in the Electric Eel obstacle in Toronto.

  • Crawling through the dirt in Kiss of Mud.

  • Wetting down the course.

  • A team poses during Tough Mudder Toronto.

  • Climbing the Spider's Web.

  • Competitor Nicole Bahn.

  • Getting a haircut.

  • Jason Capiello, Tomas Molfino, Lucas Rooney, and Anson Felder rock the schoolboy punk look.

  • Read more about Tough Mudder and the other top obstacle courses in the November issue of Outside.

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