While a marathon time of 9 hrs, 48 min and 52 seconds may not seem that impressive, it is when you consider that it was done by a man whose primary sport used to be Sumo wrestling. In fact, just the fact that he completed it, has earned 40-year-old Kelly Gneiting, who weighs 400lbs, a place in the Guinness Book of Records, for the heaviest person to ever complete a marathon.