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STOP Getting Gashed: Master LB Run Fits for Direct, Split & Gap Flow

June 15, 2025 by

Dan Carrel, Co-DC/LB Coach, Coastal Carolina

Watch the full video on Glazier Drive: LB Run Fits with Drills

This article was originally posted on the Glazier Coaching Blog.

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DRILL BREAKDOWN AND TECHNIQUES

This video covers three fundamental linebacker run fit techniques with specific drills for each flow type. The coach emphasizes these are technique-focused drills that go beyond basic fundamentals and can be adapted to various defensive calls.

DIRECT FLOW DRILLS

The primary drill focuses on downhill linebacker movement against direct flow runs. Players must understand they’re not just fitting a gap – they must “make the thing right” when defensive linemen get displaced. The key drill uses a D-lineman with a bag who puts his head in different positions, forcing the linebacker to read the cut and redirect accordingly. When defensive linemen get knocked out of position, linebackers must recognize this and fill the correct gap downhill.

SPLIT FLOW CONCEPTS AND ADJUSTMENTS

Split flow runs require different fits as players rotate responsibilities. Key position changes include linebackers shifting from front side to backside fits and adjusting to 90 fits. The coach emphasizes the “near back triangle” concept for reading these plays. When tight ends motion, it creates cascading fit adjustments where multiple defenders must rotate their gap responsibilities.

MOTION ADJUSTMENTS

Motion creates specific linebacker adjustments: nickel moves to front side fit, mike linebacker shifts from front side to backside, will linebacker goes from backside to 90 fit, and the safety becomes the wing force player. Against aggressive zone tracking teams, linebackers must anticipate quick-hitting runs by positioning their bodies in gaps early rather than reacting late.

GAP FLOW AND PULLER TECHNIQUES

Gap flow runs, particularly counter actions with pulling guards, require the “cross and close” drill where linebackers react to climbing tackles without knowing the play direction. Key concepts include identifying backside cutback players, spill players, and understanding when tackles wheel out versus block down, requiring different leverage and closing techniques.

Filed Under: Defense

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