Category: Defense
Type: Formation
4-3
The 4-3 is the most commonly used defense at the upper levels, including the NFL. At lower levels the 4-3 is not particularly popular because many coaches consider it weak against the run due to the fact there are only four down linemen. At the higher levels, the quality and size of the average down linemen makes this a non factor. In essence, if a team possesses the size, strength, and quickness necessary to run the 4-3 defense, it is a formidable defensive formation.
Besides the ever present four down linemen (2 DTs and 2 DEs), there are three line backers--two to the inside and one at the outside shoulder of the TE. Two cornerbacks and two safeties are the standard. Equally effective against most all offensive formations, the 4-3 is the default defense of choice for this author. It is easily modified for various offensive sets. The third LB (on the TE) can cover the TE, blitz, or cover any of the short zones to that side or the hook zone over the middle. The CBs can blitz with the Safety(s) assuming the Corner's responsibilities. Or a Corner can drop back in deep coverage allowing a safety blitz.
Because of its high flexibility, an offense will find it difficult to isolate a particular area or defensive player. If the 4-3 has a weakness, it is that the inside line backers are the primary tacklers for runs between the tackles and they are of course 4 to 5 yards off the ball.
Submitted by: Coach Hutchison
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