Rugby and some ideas from soccer.Camp was a player and coach at Yale University. He
pretty much copied the games but changed a few of the rules: there is a line of scrimmage,
11 on a team instead of 15, created the quarterback and the center, a forward pass, created a
lot of the defence, made penalties, tackling as low as the knee was permitted in 1888. The styles
of the uniforms and helmets have changed alot since it was invented, the helmets have more design
and protection. Also the jerseys have more color to them to make them more attractive.
The players have also become more athletic over the last decades.