Marcus Allen is not only one of the great running backs in NFL history, he is also one of the class acts in all of sports. He used hard work and determination to outperform players with superior athletic ability, and off the field he said no to the temptations of drugs and alcohol that seem to be ever-present in the lives of celebrities. When you add it all up, Allen is that rarest of commodities: a true role model. In Strength of the Heart Allen...