To Watch a Tough Mudder, First Sign This Waiver

A competitor takes part in the 2014 Tough Mudder event at the Phillip Island Grand Prix Circuit, Australia Photograph by Quinn Rooney/Getty Images

Tough Mudder has earned a reputation as one of the most grueling endurance events on the planet, attracting thousands of athletes eager to brave muddy hills, icy water, and even electrical shock fields. So challenging is the race that participants boast of surviving the “death waiver,” an irreverent reference to the mandatory indemnification contract that holds Tough Mudder harmless in the event of injury or death.

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