Simplifying a Count System & Rules in the IZ
By Adam Kirby
Offensive Line Coach
McMurry University (TX)
Twitter: @CoachKirby25
Over the past few years, McMurry University has lived on its Inside Zone concept averaging 5.48 yards per carry and consistently moving the chains. A big part of that success comes from how we teach that concept. In this clinic report, I will break down our installation process, how we identify fronts, and how our count system allows us to seamlessly block various fronts. In addition, this report will outline what and how I teach zone to my offensive line and our RB reads and entry points.
Here at McMurry University, we are a pro style, multiple formation offense. Within that scheme, our base play that we install on the first two days of camp is Inside Zone. Everything we do in the running game starts from an understanding of our IZ concept. Here is why we like to use this as our base.
Advantages of the Inside Zone Concept:
- Stretches a team horizontally as well as vertically.
- Allows your RB to hit on different holes.
- Allows for the OL to “take the path of least resistance,” meaning they can get to the man they’re blocking quicker, which enables us to play faster.
- Enables us to crease fast flowing defenses.
Identifying Fronts & Count System:
When identifying fronts, our offensive line uses a simple “even/odd” call.
- An “odd front” is any front where the guards are uncovered such as a 3-4 or 3-3.
- Conversely, an “even front” is any front where there are four down linemen such as a 4-3, 4-2, 4-4.
Obviously, this is very general, but I have found this approach to be much easier for the offensive line than making “over/under/bear” front calls. We are able to account for the variances between the fronts through the following steps of our system.
Once we get the front identified, we use a simple count system to help the linemen know who to block. I have found that this system enables us to know exactly whom we are blocking on play side and back side regardless of the front. Our basic rules for the count system are as follows:
- The center is responsible for 0.
- The guards are responsible for 1.
- The tackles are responsible for 2.
- The FB/TE is responsible for 3. In the event that there is no FB/TE, the QB then becomes responsible for 3.
The diagrams below show how we utilize the count system against an “odd” and “even” front with the TE.






How many times have you heard, “I’d hate to be a defensive coach with all the dynamic offenses out there”? To say it’s a challenge would be an accurate statement, but it would be wrong to say it is impossible. We have found that the teams who do the best job containing and stopping these offenses teams must be sound and simply get each player to buy in to his assignment. That is why our staff at Steele High School believes that the two most important components to defensive success are being aligned correctly and knowing and executing your assignment. If the players can execute those components, then the coaches can focus on the details of the scheme as a whole (ensuring that coverages match fronts, controlling gaps or wrinkling with blitzes and stunts). We ultimately play under the rule of controlling gaps and zones so we are not out-flanked trying to match man for man.
Like any spread offense, we believe in making the defense defend the entire field. We use our quick passing game in particular to try to create width in a defense’s structure and complete high percentage throws. Ideally, we’ll throw eight to 12 quick passes and gain 50-100 yards per game, which forces the linebackers and safeties to cover up our slots. This, in turn, creates vertical running lanes in the box and creates an advantage in the ground game.



At Kennedy, our overall defensive philosophy is simple, “Less is More.” This is not a new philosophy and, for sure, it is not something dynamic. To put in more descriptive terms, we are a defense that is 4-2-5 in personnel, but a mix of College 4-3, Stack 4-4, and Split 4-4 in concepts. Below are a few basics in the set-up of our defense.


















Introduction:

Introduction:
Backside Blocking
