James Cracknell - former Olympic rower

James Cracknell is a former Olympic rowing champion who has performed astonishing feats of endurance from the Sahara to Antarctica. But his toughest challenge has come by accident, not design. Two years ago his skull was smashed by a truck as he cycled across America. Miraculously he survived and his body healed, but his brain suffered significant damage. How has he responded to a test which changed his personality and his life?