Michael Phelps had ADHD as a child; he went on to win 23 Olympic gold medals

The boy who struggled to sit still in class went on to become the most decorated Olympian in history. Michael Phelps's journey from an energetic child with ADHD to a swimmer with 28 Olympic medals is one of the most remarkable stories in sport. But his success was not built on a diagnosis alone. It came through years of swimming, the support of his mother, the guidance of coach Bob Bowman and a level of preparation that helped him handle even the most unexpected problems in a race.In 2008, during the Beijing Olympics, Phelps's goggles filled with water in the middle of the 200-metre butterfly event final. He could not see the wall. He still won gold and broke the world record. The incident captured something that had defined his career for years.