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Up to 7,000 contestants brave bitter winter temperatures to compete in the 27th Tough Guy Challenge, a 15km grueling ‘mud run’ culminating in The Killing Fields - an assault course of barbed wire, fire, claustrophobic tunnels and thick muddy bitterly cold water trenches. Two contestants have died during this event’s 26-year history and many have broken bones. Tough Guy Challenge, Perton, Staffordshire, UK. 26th January 2014. Photo: Graham M. Lawrence