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Systems/I-Formation/Iso 21
RunBest for: Goal line / 2-pt6U+ · Basic

Iso 21

Tailback runs straight ahead following the fullback's lead block on the linebacker.

Concept: Line base-blocks the down men while the fullback isolates and blocks the playside linebacker.

Age version
TGCGTTESEQBFBTBFL
Ball carrierBlock / pullMotionRoute / pass
12U — Master it: Run it fast both directions and check into it by defensive look.
Play movement — schematic, not to scale

Grows with your players

Same play, more layers as they age up — teach it once and build on it every season for a consistent program.

  1. 6UIntroduce: Nail the snap/exchange, aim the right hole, and finish downhill.
  2. 8UAdd the lead: Add the pulling guard(s) leading through the hole.
  3. 10UAdd deception: Add the fake/mesh — and a counter off the very same look.
  4. 12UMaster it: Run it fast both directions and check into it by defensive look.

Every position's job

QB

Take the snap, open and hand the ball to the tailback hitting straight downhill in the two hole, then fake out the back door.

Coach it with
Field Goal / PAT Operation
TB

Take the handoff and run straight ahead off the fullback's block, cutting off whichever way the fullback walls the linebacker.

Coach it with
QB-RB Mesh Handoff RB Blitz Pickup WR Stalk Block
FB

Lead straight into the hole and isolate the playside linebacker, blocking him whichever way he flows.

Coach it with
RB Blitz Pickup WR Stalk Block TE Seal and Arc Block
Playside Guard

Base-block the down defender over or inside to hold the line of scrimmage.

Coach it with
WR Stalk Block TE Seal and Arc Block Field Goal / PAT Operation
Backside Guard

Base-block the backside down defender and stop penetration.

Coach it with
Scoop / Cutoff Block WR Stalk Block TE Seal and Arc Block
Center

Base-block the nose or first man over and secure the A-gap.

Coach it with
WR Stalk Block TE Seal and Arc Block DL Stance and Get-Off
Playside Tackle

Base-block the defender head-up and drive him off the ball.

Coach it with
WR Stalk Block TE Seal and Arc Block DB Tackle in Space
Backside Tackle

Base-block and cut off backside pursuit.

Coach it with
DB Tackle in Space Angle Tackle Drill Scoop / Cutoff Block
TE

Base-block the end or climb to seal the second level on the playside.

Coach it with
TE Seal and Arc Block Second-Level Climb to Backer Down Block Angle Drive
Split End

Stalk-block the corner or run off the safety to clear the deep alley.

Coach it with
WR Stalk Block Screen Setup & Block in Space TE Seal and Arc Block

How to teach it

  • 1Drill the fullback-linebacker collision at a fit-and-freeze pace before going live.
  • 2Teach the tailback to run to daylight and cut off the fullback's helmet.
  • 3Everyone up front base-blocks — no pulling, so stress winning the man across from you.

Common mistakes to fix

  • !Fullback ducks his head and misses the linebacker — fix by teaching eyes-up, chin-back contact.
  • !Tailback outruns his blocker — fix by having him gather and read the fullback before cutting.
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