Tens of thousands will be running for something in March.
He is doing it to honor a slain soldier.
He's doing it for charity.
Tribute bib numbers are to be worn by loved ones running for Danielle Kousoulis and Bill Fallon.
She is doing it just six months after having a baby.
Doctors closed his mouth just days before the race.
Over 2,000 pairs of shoes were donated by U.S. runners.
The event's Corporate Cup Challenge winners were honored at the Denver Athletic Club.
He ran in honor of his father and brother.
The small gap between the Chicago Marathon and the Olympic Trials doesn't worry him.