Billie Jean King, Julie Krone, Kelly Kulick-- legendary athletes and women who have come out on top against their male competitors against all odds.

Pam Reed is an ultramarathon runner who knows a thing or two about busting up the boys' club in her sport. In 2002, she became the first woman to become the overall winner of the Badwater Ultramarathon-- a grueling 130-mile race in the desert. Three years later, she became the first person to run 300 miles without sleep.

Natasha Curry talked to Reed about what it's like to go head to head against male athletes.