Today's NFL athletes are bigger, faster and more specialized than they were in the league's earliest days. See how professional football players have evolved from "everyman" to "superman."
The Evolution of the NFL: A Look at How the Game Has Changed Over
Evolution of the game: The past decades have seen multiple changes
The History of the Draft
College Player Development
Shoulder Pads Slim Down in Faster, Sleeker N.F.L. - The New York Times
Denver Broncos
The Evolution of The Super Bowl Halftime Show: Then vs. Now
Missouri Football's Ground Game Triumph and Offensive Line
Sideline of the Future NFL Football Operations
The Evolution of Personnel Groupings and Usage