Ready for takeoff

U.S. runner Lashawn Merritt gets ready on the starting blocks in one of the men's 400m heats at the London 2012 Olympic Games.

( Eric Feferberg, AFP/Getty Images / August 4, 2012 )

U.S. runner Lashawn Merritt gets ready on the starting blocks in one of the men's 400m heats at the London 2012 Olympic Games.

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