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Contestants leap off a 40-foot cliff and then climb out of the water during the World's Toughest Mudder competition Saturday, Nov. 15, 2014 at Lake Las Vegas. (Sam Morris/Las Vegas Review-Journal)
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World's Toughest Mudder: Two days of mud, sweat, and pain to begin Saturday - Canadian Running Magazine
CBS, Tough Mudder expand partnership in new deal
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2021 Tough Mudder Classic Tejon Ranch - Tough Mudder
Leaving Las Vegas: Comparison of 2014-2017's World's Toughest Mudder | Mud Run, OCR, Obstacle Course Race & Ninja Warrior Guide
Rea Kolbl repeats as World's Toughest Mudder Champion
