What is an 'iron man' in sports?

A strong man of exceptional physical endurance. In Arena Football, "Ironman" signifies participants playing both offense and defense. Typically, linemen get to pass block as well as rush the passer, wideouts play either defensive back or linebacker and fullbacks play linebacker. Each year, the league honors an Ironman of the Year, and, six of the last seven seasons, Orlando's Barry Wagner has won the award.