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Australian Mud Run: The World's Filthiest Race

Weird Competition Pits Man Against Mud

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A competitor dives into a mud pit at the Mud Run Race, held in Peats Ridge, Australia, on Dec. 5 2009.
Australia's Mud Run Race

Australia's Mud Run Race

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PEATS RIDGE, AUSTRALIA - DECEMBER 05: Glenworth Valley, Australia, on December 5, 2009 (Photo by Robert Gray/Getty Images)

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