They call it "probably the toughest event on the planet." Tough Mudder is 12 miles of running, two dozen obstacles, giant hill climbs and even electric shock.

So why do people do it? For a good cause, and there are some lunatics out there ...that love a challenge. Those people included Eyewitness News reporters Eileen Frere, Elex Michaelson and David Ono.
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