4-4 Defense (44 Stack)

Heavy short-yardage front loading the box to stop the goal-line run.

Key: All linemen and backers crowd the line in gap-control stance to submarine blockers and stuff dive plays.

Bear-style alignment covering every interior lineman on short-yardage downs.

Key: Nose covers the center and tackles cover both guards so no interior blocker can climb to linebackers.

Deep-drop prevent coverage protecting against the big play late in a half.

Key: Defenders bail to deep quarters and keep all receivers in front, tackling in bounds to run out the clock.

Passing-down alignment emphasizing edge contain to keep a scrambler in the pocket.

Key: Ends rush upfield and squeeze the pocket while keeping outside leverage so the quarterback cannot escape.

Backers show blitz then bail to disguise coverage and confuse the quarterback.

Key: Linebackers creep to the line pre-snap then drop into their zones as the ball is snapped.

Standard 4-4 stack alignment with four down linemen and four linebackers stacked behind them.

Key: Defensive ends align in 5-techniques and tackles in 3-techniques with linebackers stacked over gaps reading their keys.

The inside Mike linebacker blitzes downhill through the A-gap.

Key: Mike triggers on the snap and shoots the open A-gap while the front slants away to clear his path.

The weak inside linebacker blitzes through the backside B-gap.

Key: Will reads pass key and fires the B-gap off the tackle's outside hip with the end crashing inside.

The strong outside linebacker blitzes off the edge for contain pressure.

Key: Sam attacks the tight end's outside shoulder keeping outside leverage to force the ball back inside.

Both inside linebackers blitz the A-gaps simultaneously for interior heat.

Key: Mike and Will fire both A-gaps while safeties rotate to cover the middle and the ends contain the edges.

A cornerback blitzes off the edge from a press alignment.

Key: The corner times the snap off the receiver's release while the safety rotates over the top to that side.

The strong safety blitzes downhill off the edge or interior gap.

Key: Strong safety walks up late and fires his assigned gap while coverage rolls to a single-high look.

Both outside linebackers blitz off the edges for contain-and-collapse pressure.

Key: Sam and Will attack outside the ends while inside backers or safeties fill the interior gaps.

Both inside linebackers blitz while crossing to cross up interior blocking rules.

Key: Mike and Will cross faces through opposite A-gaps to beat man protection and combo blocks.

Five-man pressure with a three-deep, three-under zone behind it.

Key: A backer or safety blitzes while a defensive end drops to cover the vacated underneath zone.

Both defensive tackles slant hard into the A-gaps to clog the interior run.

Key: Tackles step first with their inside foot and rip across the center's and guards' faces into the A-gaps.

Both defensive ends crash inside to the B-gaps to squeeze inside runs.

Key: Ends slant off the guards' outside shoulder into the B-gap while outside backers scrape to contain the edge.

Entire defensive line slants one gap to the right to overload the strong side.

Key: Each lineman steps to the play-side gap on the snap, changing his one-gap responsibility one gap over.

Entire defensive line slants one gap to the left to overload that side.

Key: Each lineman steps to the left gap on the snap while backers fill the vacated gaps behind them.

Tackle and end on the same side exchange gaps to confuse blockers.

Key: The tackle penetrates first into the B-gap and the end loops behind him into the vacated inside gap.

Base 4-4 front paired with three-deep zone coverage for balanced run and pass defense.

Key: Two corners and free safety split the deep third while four underneath defenders drop to curl-flat and hook zones.

Base front with two deep safeties splitting the field in halves.

Key: Both safeties defend deep halves while corners jam and sink to the flats and linebackers cover the middle hook zones.

Man-free coverage with a single high safety behind man coverage across the board.

Key: Corners and outside backers match receivers man-to-man while the free safety plays center field over the top.

All-out man coverage with no deep safety help, usually paired with a blitz.

Key: Every eligible receiver is matched man-to-man and the free safety adds to the rush or robs the middle.

Three-deep zone with the strong safety rolling down as the flat defender.

Key: Strong safety fills the strong flat while free safety, corner, and corner cover the deep thirds.

Three-deep zone with the corner rolling to the flat instead of the safety.

Key: The cloud-side corner sinks to the flat while a safety rotates over the top to cover that deep third.

Two deep safeties over man coverage underneath.

Key: Corners and backers play man on their assignments while both safeties bracket over the top in halves.

Four-deep zone dividing the deep field into quarters for pass-heavy downs.

Key: Corners and safeties each defend a deep quarter and read run-pass keys to trigger downhill on run.