re: What other schools run a 4-3?

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The only difference between a 4-3 and a 3-4 is a stand up backer and an end with his hand on the group.

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Over simplification there. There are major differences within a 4-3, or 3-4 for that matter.

Philosophy is the start of a defense. Are you a bend don’t break or all blitz...or somewhere in between? Do you want to adjust defense each game (complicated) or run a base set (simple)? And so on.

Then, you look at your Joes to see what you can actually do.

You can do much of the above in various sets - 3-4, 4-3, 3-3-5 and so on. Within a 4-3 (or other set), a coach can be aggressive, passive, or a mix. Think, there is a 4-3 over, 4-3 under, 4-3 Tampa, Miami 4-3 and so on.