39-year-old Deena Kastor knows how to win the annual memorial day Bolder Boulder 10K. She's won the race from 2001-2003. The 2004 Olympic Marathon Bronze Medalist from Athens is in the twilight of her elite racing career, but she's working as hard as ever to qualify for the 10K at this year's London Olympics.
So how did she do on her return to Boulder, Colorado to race one of the biggest 10K running races in America?
Check out this video of the 2012 Bolder Boulder to find out.