[Goose]

There is no doubt that players are bigger, stronger, and faster. There is also no doubt that they receive much better coaching from many more coaches than they did 50 years ago. The whole game at every level is much more "serious". As a result, very big men trained to hit hard are doing much more damage than a bunch of kids who basically played football because it was fun. The NFL as a career went from a lark to a way to make some big money. That attracts an entirely different level of effort and delivers many more injuries along the way.

[Goose]

There is no doubt that players are bigger, stronger, and faster. There is also no doubt that they receive much better coaching from many more coaches than they did 50 years ago. The whole game at every level is much more "serious". As a result, very big men trained to hit hard are doing much more damage than a bunch of kids who basically played football because it was fun. The NFL as a career went from a lark to a way to make some big money. That attracts an entirely different level of effort and delivers many more injuries along the way.