I-Formation
A classic downhill power-running offense — QB under center with a fullback and tailback stacked in an 'I.' Physical, simple, and built to give one talented tailback the ball behind a lead blocker.
Best fit
Ideal when you have one clearly dominant running back and a willing lead-blocking fullback. Balanced and easy to understand — a strong default for teams that want to be physical without a lot of moving parts.
Base formation & personnel
QB under center; fullback ~3–4 yards deep; tailback stacked directly behind (~6–7 yards). Typically one or two TEs and one or two WRs, five linemen. 'Power-I' adds a third back for extra strong-side power.
Core philosophy
- →Downhill, north-south power running with a lead blocker in front of a talented tailback.
- →The fullback clears the path; the tailback reads the block and cuts.
- →Establish power/off-tackle, then punish over-pursuit with counter and misdirection off the same look.
- →Balanced enough to threaten play-action once the run is respected.
Bread-and-butter plays
Tailback runs off-tackle behind the fullback.
Blocking: Playside TE/T/G down-block or double the DE/DT; backside guard pulls and turns up; FB leads through and blocks the first man in the hole.
Ball: Tailback following the FB and pulling guard.
Tailback hits an interior gap with the FB isolating one LB.
Blocking: Line blocks base/down to create the gap; FB blocks the playside LB one-on-one.
Ball: Tailback straight downhill.
Quick FB or TB dive between the tackles.
Blocking: Combo/down blocks at the A/B gap.
Ball: Fullback (or tailback) — holds inside defenders.
Tailback takes the ball against the flow after showing power.
Blocking: Backside guard (sometimes tackle) pulls to kick and lead weak-side; playside down-blocks; FB fakes.
Ball: Tailback going away from flow.
Quick toss to the tailback on the perimeter.
Blocking: Playside reach/down blocks; backside seals; FB & TE lead/kick the edge.
Ball: Tailback getting to the corner.
Fake power, boot or set up, throw.
Blocking: Show run then protect; TE/WRs run a short-medium flood.
Ball: QB throws off the run fake.
Install progression
Week 1: Alignment, stances, snap; install Power + Dive both ways; teach FB lead-blocking footwork.
Week 2: Add Iso and the backside guard pull for Power/Counter.
Week 3: Add Counter and Toss/Sweep.
Week 4+: Add the Waggle/Power-Pass once the run is respected.
Full Playbook
53 playsA complete install menu — every play/call grouped by type. Tap any play for a full breakdown: every position's job, how to teach it, and common mistakes to fix.
Tailback runs off tackle behind the fullback's kickout and a pulling guard.
Key: Fullback kicks out the end man, backside guard pulls to lead, and the tackle down-blocks.
Full breakdown →Tailback runs power off the left tackle behind the lead blockers.
Key: Fullback kicks out the edge defender while the backside guard pulls through the hole.
Full breakdown →Tailback runs straight ahead following the fullback's lead block on the linebacker.
Key: Line base-blocks the down men while the fullback isolates and blocks the playside linebacker.
Full breakdown →Tailback runs straight ahead following the fullback's lead block on the linebacker.
Key: Line base-blocks the down men while the fullback isolates and blocks the playside linebacker.
Full breakdown →Fullback takes a quick dive handoff up the middle.
Key: Interior line drive-blocks straight ahead to create a quick vertical seam.
Full breakdown →Fullback takes a quick dive handoff up the middle.
Key: Interior line drive-blocks straight ahead to create a quick vertical seam.
Full breakdown →Tailback catches a pitch and runs wide behind the fullback and pulling guard.
Key: Playside blocks down, the guard pulls to kick, and the fullback leads around the edge.
Full breakdown →Tailback catches a pitch and runs wide behind the fullback and pulling guard.
Key: Playside blocks down, the guard pulls to kick, and the fullback leads around the edge.
Full breakdown →Tailback runs off tackle behind the fullback into the six hole.
Key: Tight end and tackle down-block while the fullback leads up on the force defender.
Full breakdown →Tailback runs off tackle behind the fullback into the six hole.
Key: Tight end and tackle down-block while the fullback leads up on the force defender.
Full breakdown →Tailback takes a counter step then follows backside pullers to the other side.
Key: Backside guard kicks out the end man while the backside tackle wraps through the hole.
Full breakdown →Tailback runs inside zone reading the first down lineman for a cut.
Key: Line zone-steps playside and combos to the linebackers while the fullback leads.
Full breakdown →Tailback runs inside zone reading the first down lineman for a cut.
Key: Line zone-steps playside and combos to the linebackers while the fullback leads.
Full breakdown →Tailback stretches the ball wide reading the edge to bounce or cut up.
Key: Line reach-blocks to hook and seal defenders while the fullback leads to the perimeter.
Full breakdown →Tailback stretches the ball wide reading the edge to bounce or cut up.
Key: Line reach-blocks to hook and seal defenders while the fullback leads to the perimeter.
Full breakdown →Fullback or tailback hits a quick inside trap up the middle.
Key: Backside guard pulls to trap the first down lineman past the down block.
Full breakdown →Fullback or tailback hits a quick inside trap up the middle.
Key: Backside guard pulls to trap the first down lineman past the down block.
Full breakdown →Fullback runs the belly off tackle on the quarterback ride.
Key: Playside down-blocks while the tight end and tackle seal the edge.
Full breakdown →Fullback runs the belly off tackle on the quarterback ride.
Key: Playside down-blocks while the tight end and tackle seal the edge.
Full breakdown →Quarterback surges straight ahead behind the center on short yardage.
Key: Center and guards fire out low to create immediate push at the point of attack.
Full breakdown →Quarterback surges straight ahead behind the center on short yardage.
Key: Center and guards fire out low to create immediate push at the point of attack.
Full breakdown →Quarterback reads a curl-flat combination for a rhythm completion.
Key: Line sets full protection while the outside receiver curls and the back runs the flat.
Full breakdown →Quarterback reads a curl-flat combination for a rhythm completion.
Key: Line sets full protection while the outside receiver curls and the back runs the flat.
Full breakdown →A hitch-corner combo high-lows the flat defender.
Key: Outside receiver hitches while the flanker runs a corner over the top.
Full breakdown →A hitch-corner combo high-lows the flat defender.
Key: Outside receiver hitches while the flanker runs a corner over the top.
Full breakdown →Receivers stretch the field vertically as the quarterback reads the safeties.
Key: Line sets drop-back protection while receivers bend their seams versus coverage.
Full breakdown →Receivers stretch the field vertically as the quarterback reads the safeties.
Key: Line sets drop-back protection while receivers bend their seams versus coverage.
Full breakdown →Fullback releases to the flat as a quick outlet on a swing route.
Key: Line sets protection while the fullback swings wide as a checkdown target.
Full breakdown →Fullback releases to the flat as a quick outlet on a swing route.
Key: Line sets protection while the fullback swings wide as a checkdown target.
Full breakdown →Split end runs a quick three-step slant for an easy throw.
Key: Line sets quick protection while the flanker clears the underneath coverage.
Full breakdown →Split end runs a quick three-step slant for an easy throw.
Key: Line sets quick protection while the flanker clears the underneath coverage.
Full breakdown →Outside receiver runs a five-yard hitch and turns for the quick throw.
Key: Line sets quick pass protection while the receiver settles in the soft zone.
Full breakdown →Outside receiver runs a five-yard hitch and turns for the quick throw.
Key: Line sets quick pass protection while the receiver settles in the soft zone.
Full breakdown →Tailback slips out after showing pass protection and catches a screen.
Key: Guard and tackle release after a brief set to lead-block for the back.
Full breakdown →Tailback slips out after showing pass protection and catches a screen.
Key: Guard and tackle release after a brief set to lead-block for the back.
Full breakdown →Slot or flanker runs a bubble for a quick perimeter throw.
Key: Outside receiver stalk-blocks the corner to spring the alley.
Full breakdown →Slot or flanker runs a bubble for a quick perimeter throw.
Key: Outside receiver stalk-blocks the corner to spring the alley.
Full breakdown →Tight end releases late and catches a screen behind interior blockers.
Key: Guards release downfield to lead-block while the quarterback sells a drop.
Full breakdown →Tight end releases late and catches a screen behind interior blockers.
Key: Guards release downfield to lead-block while the quarterback sells a drop.
Full breakdown →Quarterback fakes power then throws off the run fake to the tight end or split end.
Key: Line shows power blocking while the tight end runs a corner and the split end a post.
Full breakdown →Quarterback fakes power then throws off the run fake to the tight end or split end.
Key: Line shows power blocking while the tight end runs a corner and the split end a post.
Full breakdown →Quarterback fakes the run and boots right with a flood of receivers.
Key: Backside protects the edge while the tight end drags and the flanker runs a corner.
Full breakdown →Quarterback fakes the run and boots left with a flood of receivers.
Key: Backside protects the edge while the tight end drags and the flanker runs a corner.
Full breakdown →Quarterback fakes the iso dive then throws downfield.
Key: Line sells run before setting while the fullback leaks to the flat and a receiver goes deep.
Full breakdown →Quarterback fakes the iso dive then throws downfield.
Key: Line sells run before setting while the fullback leaks to the flat and a receiver goes deep.
Full breakdown →Quarterback fakes the toss sweep then pulls up to throw.
Key: Line sweep-blocks to sell the run while a receiver slips behind the biting defense.
Full breakdown →Quarterback fakes the toss sweep then pulls up to throw.
Key: Line sweep-blocks to sell the run while a receiver slips behind the biting defense.
Full breakdown →Tailback starts a sweep then hands to a receiver coming the opposite way.
Key: Backside cuts off pursuit while a lineman leads around the far edge.
Full breakdown →Tailback starts a sweep then hands to a receiver coming the opposite way.
Key: Backside cuts off pursuit while a lineman leads around the far edge.
Full breakdown →Tailback takes the toss sweep then stops and throws downfield.
Key: Line sweep-blocks to sell the run while the flanker sneaks behind the secondary.
Full breakdown →Tailback takes the toss sweep then stops and throws downfield.
Key: Line sweep-blocks to sell the run while the flanker sneaks behind the secondary.
Full breakdown →Quarterback fakes a sweep handoff and a hidden receiver takes it the other way.
Key: Line flows to sell the sweep while the ball-carrier delays before cutting back against pursuit.
Full breakdown →Quarterback fakes a sweep handoff and a hidden receiver takes it the other way.
Key: Line flows to sell the sweep while the ball-carrier delays before cutting back against pursuit.
Full breakdown →More offense systems
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