Jamaican Olympic gold medallist Usain Bolt (bottom) runs ahead of Brazilian athlete Jefferson Lucindo (R), U.S. sprinter Wallace Spearmon and British athlete Mark Lewis-Francis (L), during the "Mano a Mano" men's 100 metres challenge on Copacabana beach in Rio de Janeiro August 17, 2014. REUTERS/Pilar Olivares (BRAZIL - Tags: SPORT ATHLETICS)