The initial plan was for Usain Bolt to call it quits after the 2016 Summer Olympics in Rio, but he has had a change of heart. "That was the initial plan [to sign off after Rio]," he told the Daily Mail. "But my sponsor has asked me to go on for another year; to 2017 and London." By London, Bolt is referring to the 2017 World Athletic Championships. At that time, Usain will only be 30 years old. 

In addition to announcing when he will retire, Bolt also says he plans on focusing his time and effort on the 100m dash in 2017, saying, "But I'll be doing one event, the 100. I've already discussed it with my coach. I can concentrate on that, and on retiring on a winning note." Usain would like to break the world record of 9.58 seconds he set in 2009 at Berlin. We're going to love to see him try and make that happen.

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[via BBC Sport]