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The world's top athletes are different from the rest of us. They have a drive, a singular will that makes them winners, but it can also be their undoing. Stephen Sackur speaks to Graeme Obree, a world champion cyclist in the 1990s, famous for his self-built bikes and unique racing style. But while making his name on the track he was battling severe depression, which led to suicide bids and family break up. What happens when elite sport takes you to the edge?