<P> In American football, the 4--4 defense is a defensive alignment consisting of four down linemen and four linebackers . </P> <P> Originally seen as a passing defense against the spread, modern versions of the 4 - 4 are attacking defenses stocked with multiple blitz packages that can easily be concealed and altered . The modern defense is based on speed, athleticism and intelligence rather than on size and strength . Versatility is key because players may have to change roles from one play to the next . A top priority of the 4--4 defense is stopping the run by keeping eight men close to the line of scrimmage . This also makes it difficult for the offense to identify where the pressure comes from when the defense blitzes . </P>

Who runs a 4-4 defense in the nfl