Bill Parcells has been coach to the Dallas Cowboys, the New York Giants, the New England Patriots and the New York Jets. Robert B. Stanton/Getty Images hide caption

itoggle caption Robert B. Stanton/Getty Images

There are more than 160 living Hall of Fame football players. The famous busts of the inductees line the walls in the Pro Football Hall of Fame in Canton, Ohio. JW Ogden/Flickr hide caption

itoggle caption JW Ogden/Flickr

Eric Fisher, offensive tackle from Central Michigan, was the No. 1 pick in the 2013 NFL draft. He was chosen by the Kansas City Chiefs. Rich Kane /UPI /Landov hide caption

itoggle caption Rich Kane /UPI /Landov