The Positions in a Football Secondary
Football Defense Keys
How to Choose a Base Defense in American Football

Types of Football Defenses

Flex

The flex defense is a 4-3 alignment, but it flexes (moves back) two defensive linemen (DT and DE) off the line of scrimmage by 2 or 3 yards. These two offset linemen read the blocking combinations of the offense and attempt to make the tackle (or the sack) while their teammates try to break down the offense’s blocking patterns.

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