Football IQ for an offensive lineman starts before contact.
It starts with the front, the support, the safety rotation, the linebacker depth, the defender’s favorite move, and the communication needed to get five players seeing the same picture. The best linemen are not just waiting for the ball to move. They are processing the defense before the snap.
On this episode of Football IQ, presented by American Football IQ, Doug Brady talks with David Diaz-Infante about the details separating a player who knows the play from one who understands the game. American Football IQ helps players, coaches, and serious students of the game move past memorizing terms and start understanding what they are seeing before the snap. Through film-room style breakdowns, tactical education, and training tools, AFIQ helps you read defenses, recognize coverages, and process the game faster.
David Diaz-Infante is a two-time Super Bowl champion and former NFL offensive lineman who played for the Denver Broncos, Philadelphia Eagles, and San Diego Chargers. After his playing career, he coached offensive line in the NFL and brought decades of experience as a player, teacher, and broadcaster to his work developing linemen and teaching the game.
Identity Gives Players Answers
Diaz-Infante’s Denver teams were built around a clear offensive identity. They knew who they were and they knew what defenses had to stop. Under Alex Gibbs, it started with outside zone and the answers built from it.
He said:
“You have to force defenses to defend something. And then everything comes off that”
There is a real coaching point in that line. If players cannot explain what the offense is built around, they are probably memorizing plays instead of understanding the system.
The best offensive lines know how the offense wins. They understand why the run game, keeper game, boot game, motions, and adjustments fit together. Once the foundation makes sense, players can play with confidence within the system.
Film Study Has to Become a Plan
Great offensive linemen do not watch film just to check a box. They study the defender across from them and build a plan.
What is his best move?
When does he use it?
How does he counter?
What does he trust when the game is on the line?
Diaz-Infante learned that from Gary Zimmerman, who studied opponents with a simple purpose:
“I know that I’m going to take away what he does best. Because I know when the game’s on the line, he’s going to do what he does best.”
A better way to teach film study starts there. Do not only ask players what front they saw, ask what the defender wants to win with. Ask how they plan to take it away.
Film turns into preparation when players leave the room with a matchup plan.
One Language
Diaz-Infante’s value as a player came from knowing all five positions, short snapping, long snapping, and stepping into games without the offense changing around him. He talked about practicing for injured starters, taking scout team reps, taking starter reps, and preparing like the game would find him.
None of that works without shared language.
Diaz-Infante said:
“how do we all speak the same language? That’s incredibly important.”
Motion happens, the defense bumps, the linebacker walks up, the front shifts. The tackle, guard, and center have to communicate quickly because the picture can change before the ball is snapped.
Coaches have to tie words to pictures so players know exactly what each call means. Show it, walk it, drill it, and repeat it until the whole unit sees the adjustment the same way.
A fast offensive line usually has clean language behind it.
Pass Protection Is a Fight for Position
Diaz-Infante does not talk about pass protection like it is passive. He talks about basketball and boxing.
Protect the hoop. Stay inside out. Do not let the rusher cross you over and dunk on the quarterback. Use the hands with timing. Train the body to react to a target.
His teaching progression is simple:
“I always tell people it’s eyes, feet, hands. My eyes track, my feet move, my hands throw.”
The order is everything. The eyes find the target, the feet put the body in position, and the hands strike with purpose.
When the order gets flipped, the player lunges, guesses, or opens the gate. Diaz-Infante also connected boxing to line play because the rusher reacts to stimulus. The lineman can show a hand, take it away, refit, parry, and strike with timing.
Don’t let drill work live in perfect-world reps. Players need answers for bad hands, lost leverage, and messy positions because those are the reps that show up on game day.
Teach the Fight Inside the Assignment
Diaz-Infante kept coming back to the small details that decide a rep: foot placement, hat placement, hand placement, body mass, balance, leverage, and defender behavior.
He called it:
“It’s the game within the game.”
The play call gives the assignment. The player still has to win the fight inside that assignment.
Can he stretch the defender?
Is he able to keep his body mass tied to his feet?
Can he move from bad position back to good position?
Is he able to take away the defender’s best move?
Those details turn a player from someone who knows the play into someone who can play the position.
Good Teaching Speeds Up Processing
Diaz-Infante credited Alex Gibbs for teaching through categories. Instead of loading players down with a long list of rules, Gibbs helped them organize the game.
Diaz-Infante described it as putting things in funnels. Concepts made the game easier to carry, allowing players to sort problems faster because they understood how the system worked.
Every coach can learn from that approach.
The meeting room should not overload players. It should help them recognize patterns and give them tools they can use under pressure.
Curiosity Keeps the Game Growing
One of the best parts of Diaz-Infante’s story is how much he kept learning after he finished playing.
Broadcasting exposed him to different systems and coaches. He talked about studying Urban Meyer’s zone read at Utah and seeing how it connected to the keeper game. Later, he sat in quarterback meetings with Josh McCown and Ryan Fitzpatrick to understand protection, hot throws, coverage structure, and how quarterbacks process answers.
A coach does not need every new idea. He needs to know why something works and whether his players can carry it into a game.
Can we teach it?
Does it fit our language?
Does it solve a problem?
Can our players carry it into a game?
The game keeps changing, but clear teaching still wins.
What Coaches Can Take Back to the O-Line Room
The best offensive linemen know more than the call.
They understand the system, the defender, the front, and the communication before the ball is snapped. They know where the play can break, so they can process faster and play more confidently once it starts.
Diaz-Infante’s story brings all of it together. He was cut, brought back, placed on the practice squad, rotated in with starters, and eventually became part of two Super Bowl teams. His career was built on preparation, shared language, toughness, and a willingness to keep learning.
For offensive line coaches, the takeaway is clear.
Build the identity. Teach the language. Study the opponent. Drill real problems. Help players understand the game within the game.
Football IQ shows up before the ball is ever snapped.
Related:
Defensive Football IQ Starts Before the Snap
Adjusting to Defensive Fronts: How Protection and Route Concepts Manipulate Linebackers and Safeties
Connect on X:
David Diaz-Infante: @DDI63
Keith Grabowski: @CoachKGrabowski
Doug Brady: @CoachDougBrady