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Jamaican Olympic gold medalist Usain Bolt jokes during a training session of the "Mano a Mano" challenge at Copacabana beach in Rio de Janeiro, Brazil, Friday, March 29, 2013. Bolt will compete Sunday at a track specially built at the famous beach, challenging Antigua and Barbuda's Daniel Bailey, Ecuador's Alex Quinones, and a Brazilian athlete from a local qualifier. (AP Photo/Felipe Dana)