MUD RUN: The SEAL Extreme Challenge, a three-and-a-half-mile trail run and obstacle course in Cosby, Tenn., proved to be a fitting test of the caveman lifestyle.

Photo by Tyler Oxendine

MUD RUN: The SEAL Extreme Challenge, a three-and-a-half-mile trail run and obstacle course in Cosby, Tenn., proved to be a fitting test of the caveman lifestyle.

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