Peyton Manning is set to retire and his good friend and former coach, David Cutcliffe, speaks on how Manning changed the game for the better. The Duke coach talks about how Manning not only made his teammates better, but made his coaches better as well. Cutcliffe was Manning's offensive coordinator at the University of Tennessee and the two have stayed close friends ever since. Listen to coach Cutcliffe's take on the future Hall of Famer right here.