What is a 4 3 under defense?

4-3 Under is essentially running the weak side of the defensive line to the strong side, and walking down your SAM LB over the TE. The NT is lined up in the 1-gap to the strong side, with the LDE in 5-gap, and the SAM on the outside edge of the TE, called the 9-technique.Jul 23, 2009

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