Seven-time Tour de France winner Lance Armstrong rides in Los Angeles' Griffith Park with local cyclists on September 10, 2009. Armstrong used his Twitter account to invite local rides to join him for a morning ride. Getty Images logo Getty Images 29 months ago

Seven-time Tour de France winner Lance Armstrong rides in Los Angeles' Griffith Park with local cyclists on September 10, 2009. Armstrong used his Twitter account to invite local rides to join him for a morning ride.