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Designed by British special forces soldiers, the Tough Mudder obstacle course is a test of strength, endurance and heart. Thousands of participants in a weekend competition at Mount St. Louis Moonstone, north of Toronto, dodged various man-made obstacles to raise money for WoundedWarriors.ca, which provides money for injured soldiers. (Editor's note: An earlier version of this gallery contained incorrect information about the charity that the race raised money for. This version has been corrected.)

A participant leaps off a platform in an obstacle called Walk the Plank. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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A ToughMudder participant faces the task before her as she prepares to attempt the Hangin' Tough obstacle. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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A participant is pulled from one of a series of muddy trenches in a Tough Mudder obstacle known as the Mud Mile. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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A steep hill climb toward the very end of the course left many participants struggling to catch their breath. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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Two participants leap from a platform into a pool of water in an obstacle called Walk the Plank. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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A man powers through the 10,000-volt live wires hanging above him in the Electric Eel obstacle shortly before the finish line. Over 15,000 people signed up for the Mount St. Louis Tough Mudder, a military-style obstacle course designed to test participants' endurance, strength and heart, August 18, 2012.

Galit Rodan/The Globe and Mail

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