Don't despise empiric truth. Lots of things work in practice for which the laboratory has never found proof.
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If you go to school and practice for five days a week, it still gives you two days you can go and see your friends, you can go to the movies, you do whatever you like to do.
A little more movement of the defensive side of the ball, some rules that will be unnoticed, but a big rule will be allowing the jack linebacker to move out of the box sideline to sideline.

