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By watching YouTube videos Julius Yego taught himself to become one of Kenya's champions. The 26-year-old athlete is the reigning Commonwealth Champion after throwing 91.39m earlier this year. He is now one of his country's top medal hopes at the World Athletics Championships in Beijing. (Picture: Kenya's Julius Yego competes in the men's javelin throw final at 2012 London Olympics; Credit: FRANCK FIFE/AFP/GettyImages)