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The Marathon des Sables is described as the 'toughest footrace on Earth' - a six-day journey across the Sahara Desert covering more than 240 km (150 miles). It's daunting enough for seasoned athletes, but imagine doing it with two prosthetic legs. Duncan Slater did - he lost both legs when he served in the RAF in Afghanistan - before succumbing to an injury on day four of the race. (Pic: Duncan Slater; Credit: walkingwiththewounded.org.uk)