Named an All-American at the University of Minnesota in 1929 as both a tackle and fullback, Nagurski turned pro to play for the National Football League’s Chicago Bears, becoming the archetypical pile-driving fullback of the 1930s. Although he was never the league’s rushing leader, Nagurski was nearly impossible to stop without a gain and often dragged multiple tacklers with him before going down. In addition to football, Nagurski competed in what other sport on a professional level? Discuss