You can watch video of Alabama’s Nick Saban explaining the 3-4 defense here. You can make this video full screen in order to better see the X’s and O’s. In this video, Auburn’s football coach Gene Chizik explains why he likes the 4-3 defense. Chizik explains how the line plays and the options available for your linebackers. This is an excellent primer on the defense. He explains the characteristics of what he needs in linemen and in linebackers.