Once the darling of the cycling world and a symbol of hope for those battling cancer, Armstrong recently suffered a spectacular fall from grace following revelations that the US Anti-Doping Agency possessed evidence that he had been doping since the late 1990s. He was subsequently stripped of his record seven consecutive Tour de France titles as well as his Olympic medal and banned from the sport for life. After repeated denials, Armstrong finally came clean in 2013, admitting his guilt to whom? Discuss