NEW YORK -OCTOBER 31:  Runners and admirers stand with Lance Armstrong (2R) in midtown Manhattan for a group run through Central Park on October 31, 2009 in New York City. Following a Twitter notice, Armstrong, 38, arrived at Niketown to begin the run. Armstrong, the seven-time Tour de France winner, has twice run the New York City Marathon - in 2006 and 2007. Getty Images logo Getty Images 4 weeks ago

NEW YORK -OCTOBER 31: Runners and admirers stand with Lance Armstrong (2R) in midtown Manhattan for a group run through Central Park on October 31, 2009 in New York City. Following a Twitter notice, Armstrong, 38, arrived at Niketown to begin the run. Armstrong, the seven-time Tour de France winner, has twice run the New York City Marathon - in 2006 and 2007.