Lance Armstrong's story is well-known -- the American professional cyclist beat testicular cancer, won his sport's biggest and most grueling race, the Tour de France, a record seven times from 1995-2001. Throughout his title run, there was rampant speculation that Armstrong was using performance enhancing drugs, claims that Armstrong vehemently denied for years. But in 2013, during an interview with Oprah Winfrey, he publicly admitted to doping while he was racing in the pro peloton. He was summarily stripped of his Tour de France titles and given a lifetime ban from the sport.