A social activist from New Mexico finds a new calling in Africa.
What's it like to race through a field on all fours?
Shelby Erdahl refuses to give up.
The annual run reaps big dollars for a good cause
Ida Keeling can't stop, and she won't stop.
A documentary short depicts the struggle to maintain one's livelihood for Olympians in poverty.
This RB ends workout by running 19.5 MPH ON AN INCLINE!
This isn't a hoax -- it's all about intensity.
Gibb was the first women to compete in the Boston Marathon.
Adrianne Haslet-Davis joins the show