Terminology: Bubble

7 Feb

A bubble is the space or void between a Linebacker and the line of scrimmage.  It’s a soft spot in the defensive front that offenses routinely attack with a running play.

The bubbles pictured below are over the Guards.  Where they appear in other defenses depends upon the scheme being used, but it’s easy to see why offenses will attack them.

The bubbles in the College 4-3 defense pictured below are over the Center and the Offensive Tackles. They’re generally about 5yds deep which gives the LBs time to read and react to any play.


The offense pictured below is attacking the Mike (middle) Linebacker in the bubble over the Center (65) in what looks like a beautifully blocked “Iso” play.

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