A blocking technique in which offensive linemen, and sometimes other blockers, block legally below the waist (i.e., from the front of the defensive player) in an attempt to bring the defenders to ground, making them unable to pursue a running back for the short time needed for the back to find a gap in the defense. The technique is somewhat controversial, as it carries a risk of serious leg injuries to the blocked defenders. The NFL's Denver Broncos are especially famous (or infamous) for using this technique.