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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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