2012 Tough Mudder Extreme Endurance Challenge …A participant tackles the Mud Mile obstacle during the 2012 Tough Mudder Extreme Endurance Challenge held in the grounds of Drumlanrig Castle and Country Estate in Dumfriesshire. PRESS ASSOCIATION Photo. Picture date: Saturday July 14, 2012. The 12 mile obstacle course is designed by Special Forces to test fitness, stamina and mental strength. Over 5,000 participants are taking part throughout the weekend, with 100,000 gallons of mud, participants braved waist high swamps, underground tunnels, Fire walking and electric shocks amongst the 22 obstacles. Photo credit should read: Andrew Milligan/PA Wire

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