Michael Phelps

Associated Press
FILE - This July 30, 2011 file photo shows Michael Phelps showing the gold medal he won in the men's 100m butterfly event at the FINA Swimming World Championships,  in Shanghai, China. Phelps says he has started training earlier than at any time since 2007, before his record-setting Beijing Olympics. The 16-time medalist says "there's a lot more drive inside of me" after the motivation hasn't always been there the last three years. (AP Photo/Michael Sohn, File)

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Olympic champion Michael Phelps has announced his intention to retire after the London Olympics. 

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