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For nine years, nine months and nine days, American 400m hurdler Edwin Moses was unbeaten in races, winning 122 in a row including two Olympic gold medals. But how did he become unbeatable?

Sportshour’s Caroline Barker speaks to the double Olympic champion about his dominance, his then-revolutionary 13 strides and how an introduction from Morgan Freeman has finally brought his life to the screen.

Image: American athlete Edwin Moses, wearing sunglasses, clears a hurdle during the men's 400m hurdles event of the 1988 Summer Olympics, at the Seoul Olympic Stadium in Seoul, South Korea, September 1988. Moses won bronze in the men's 400m hurdles at the Games. (Photo by Bongarts/Getty Images)