Perhaps the most electric athlete ever to play the quarterback position, Eagles centerpiece Michael Vick has traveled quite the tumultuous road. From first-overall pick in 2001 and promising franchise man to PETA pariah following dog-fighting ring charges in 2007, Vick is only a couple years removed from being without a roster spot.
Why He's Tough: After leaving Syracuse as an All-American in football and lacrosse, Jim Brown went on to produce arguably the greatest rushing career in history. In 118 career games, Brown averaged 104.3 yards per game and 5.2 yards per carry. He never missed a game in his career. (#2)