Defense · Fronts & Alignments
Fronts & Alignments
Personnel tells you who is on the field. The defensive front tells you where those players line up — and that alignment can give you clues about how the defense plans to attack the offense.
Start Here
What Is It?
A defensive front describes how the defenders near the line of scrimmage are arranged before the snap.
Two defenses can have similar personnel on the field but line those players up very differently.
Some defenders line up directly across from offensive linemen. Others line up in the gaps between them. EDGE defenders may line up outside the offensive tackles.
Start With This
PERSONNEL
Who does the defense have on the field?
FRONT
Where are those defenders lined up?
Learning to recognize the front helps you understand where the defense may be strong, where running lanes might appear and which offensive linemen could face difficult blocking assignments.
Football Watching 101
How It Works
Start with the offensive line.
Find the center, then look at where the defensive linemen are positioned relative to him, the guards and the tackles.
A defender can line up directly across from an offensive lineman, slightly shaded toward one shoulder, or directly in a gap.
Head-Up
The defender lines up approximately directly across from an offensive lineman.
Shade
The defender lines up slightly toward one shoulder of an offensive lineman.
Gap
The defender aligns in or attacks the space between offensive linemen.
Coaches use technique numbers such as 0-technique, 1-technique and 3-technique to describe these alignments more precisely.
You do not need to memorize every technique number to understand football.
For now, learn to recognize whether a defender is over the center, over a guard, over a tackle, in a gap or outside the offensive line.
Read The Front From The Center Out
Interior
Defenders around the center and guards
Edge
Defenders outside the offensive tackles
Instead of memorizing every technique number immediately, begin by looking at where each defender is positioned relative to the center, guards and tackles.
Simplified defensive front — exact alignments can change based on scheme, formation, strength and the defensive call
The Reason
Why Teams Use It
Defensive fronts are designed to create favorable matchups and control specific areas of the line of scrimmage.
Moving a defensive tackle from directly over an offensive lineman to one shoulder can change the blocking angle dramatically.
The defense can also shift strength toward one side of the formation.
That can make it more difficult for the offense to execute certain running plays or force offensive linemen to make different combination blocks.
Fronts also work together with linebackers.
A defensive lineman may occupy a blocker specifically so a linebacker behind him can attack an open running lane.
This is why you should eventually think of the defensive front and linebackers as a connected system rather than separate groups.
Remember These
Front & Alignment Terms You'll Hear
Even Front
A general term commonly used for fronts built around an even number of down defensive linemen, often associated with four-man structures.
Odd Front
A general term commonly used for fronts built around an odd number of down defensive linemen, often with a defender aligned over or near the center.
Over Front
A front in which the defensive line shifts its strength toward the offense's declared or formation strength. The exact structure varies by defensive system.
Under Front
A front that shifts the defensive line in the opposite relationship from an Over structure, changing which offensive linemen face shaded defenders and where linebackers fit.
0-Technique
A defensive lineman aligned directly over the center. This player is often called a nose tackle in fronts that use this alignment.
1-Technique
A defensive tackle aligned on a shoulder of the center, placing him in position to attack an interior gap.
3-Technique
A defensive tackle aligned on the outside shoulder of an offensive guard. This is one of the most commonly discussed defensive-line alignments.
Head-Up
A defender aligns approximately directly across from an offensive blocker rather than clearly shading one side.
Shade
A defender aligns slightly to one side of an offensive blocker instead of directly across from him.
EDGE Alignment
A defender lines up outside or near the offensive tackle, positioning himself to defend the edge and potentially rush the quarterback.
Watch The Game Differently
What Should I Watch For On Saturday?
The easiest way to begin reading defensive fronts is to find the center first.
Then work outward.
Your Saturday Checklist
Who is over or near the center?
Where are the defensive tackles?
Are they head-up or shaded?
Where are the EDGE defenders?
Is one side of the front heavier than the other?
Next, watch what happens when the offense changes formation.
Does the defense shift?
Does a defensive tackle move from one side of the center to the other? Does an EDGE defender widen his alignment? Does a linebacker move down toward the line?
Those changes are clues that the defense is adjusting to the offensive formation.
You do not need to identify the exact name of every front.
If you can recognize that the defense has changed where its strongest players are lined up, you are already seeing something important.
Your sequence is: Find the center → Work outward → Locate the defensive linemen → Find the EDGE defenders → Watch for shifts.
Keep Learning
Related Concepts
Defense Lesson 3
Gaps & Run Fits
Now learn the spaces between offensive linemen and how defenders work together to make sure every running lane is accounted for.