Trap
Bait the DT upfield, then blindside him
The Trap is one of football's oldest and most deceptive run plays. The playside guard intentionally releases past the aligned defensive tackle (skipping his block entirely and climbing to a linebacker), leaving the DT unblocked. As the DT charges into the backfield thinking he has a free rush, the backside guard pulls across the formation and blindsides him from the side. The running back follows the trap block through the vacated gap. While classic Trap usage has declined to 2-3% of run plays, the "Wham" variant, using an H-back or tight end to trap an interior DL, has kept the concept alive in modern offenses.
Blocking Assignments
The playside guard skips/releases past the aligned DT and climbs to the playside (or backside) linebacker at the second level, the DT is intentionally left unblocked as the trap target. The center blocks back on the backside A-gap defender. The backside guard pulls across the formation and trap-blocks the unblocked DT from the side as he rushes upfield. The playside tackle blocks down on the next inside defender, and the backside tackle hinge-blocks to prevent backside pursuit. The key is the timing: the pulling guard must arrive as the DT commits upfield.
Running Back Read
Run directly at the gap vacated by the trap block. Read the trap block on the penetrating DT: if the DT is kicked laterally (outside), run inside the trap block through the created gap. If the DT reads the trap and squeezes down, bounce outside. The play hits fast, there is no time for hesitation. The aiming point is the playside A-gap or B-gap depending on the front.
Why It Works
The Trap exploits aggressive defensive line play. When a DT is coached to rush upfield and penetrate gaps, the trap block catches him completely off guard. Because the playside guard ignores him and climbs to the linebacker, the DT reads it as a free rush, making him an even easier target. The result is a massive running lane where the defender used to be, with the pulling guard arriving at full speed to clear the path.