Duo Blocking: Double Teams and a Linebacker Read

Aug 19

2 min read

Updated: 2 hours ago

Duo is a downhill run built around combinations that drive defensive linemen and release to linebackers. The running back commonly presses an interior track and reads the designated linebacker, often called the Mike, before choosing his crease.

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Duo is a downhill run concept built around vertical double teams at the line of scrimmage and a running back who reads the middle linebacker.

The play is sometimes described as Power without a puller. That helps distinguish it from Power O, but it is a shortcut: the precise blocking rules and the back's read still matter.

The double teams have two jobs

The first job is to secure and move the defensive lineman. The second is to release one blocker toward the assigned linebacker when the angle allows. Leaving too early can surrender the first level; staying too long can leave the linebacker free.

The number and location of combinations depend on the defensive front. Duo is not a guarantee that the same two pairs double team on every snap. An attached tight end often helps secure the edge, and another tight end or wing can change that surface.

Why the back presses the linebacker

The initial downhill track makes the linebacker commit. If he fills one lane, the runner can take the available space beside or behind the combination. If the edge widens and the blocking supports it, the ball can bounce.

For example, a back pressing inside can hold a linebacker long enough for a guard to reach him. A premature cut may let the linebacker bypass the block. The runner's decision and the linemen's releases must work together.

Duo versus inside zone

Inside zone also uses combinations and allows cuts, so the runner's path alone cannot distinguish them. Duo generally emphasizes downhill double teams and gap oriented relationships, with the back reading a linebacker. Inside zone organizes the front through zone rules and commonly begins with defensive line leverage reads.

Coaches classify and name these schemes differently. When the film is unclear, describe the visible double teams and reads rather than declaring the call from one handoff.

How the defense disrupts it

An interior defender can anchor or split a combination and prevent a clean climb. A linebacker can attack the arriving block without overcommitting. Covering more interior linemen with a Bear front can reduce easy combinations.

Play action provides a complementary answer when linebackers attack the downhill run aggressively. The offense can show the same initial picture before throwing into the space they leave.