Warrick Dunn knows how to keep his head down and keep moving. For 12 years, his career depended on it.
The former running back was a first round pick for the NFL in 1997, and was later named Rookie of the Year. His professional career spanned more than a decade, with three stints in the Pro Bowl and countless other awards and accolades. In his final year with the Tampa Bay Buccaneers, he became the sixth NFL player ever to rush more than 10,000 yards.
For most athletes, that kind of resume would be enough. But for Warrick Dunn, it's just one small fraction of the story that reveals his real endurance.