A team of competitors jump in the air after completing the Merrell Down & Dirty National Mud and Obstacle Series at the Aurora Sports Park near Denver, Colorado, on June 24, 2012. (Nathan Bilow/AP Images for Merrell) #

A team of competitors jump in the air after completing the Merrell Down & Dirty National Mud and Obstacle Series at the Aurora Sports Park near Denver, Colorado, on June 24, 2012. (Nathan Bilow/AP Images for Merrell) #

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