Cross Block: Two linemen used; the outside linemen steps down, down blocking on first defender inside of him. The inside linemen steps outside, blocking the first defender outside of him. This is used with tackle /guard combination or the tackle /tight end combination. This is an extremely successful block in youth football. This is has the same nature as a trap block, but it is a shorter distance for the crossing linemen to travel. This works really well against disciplined gap defenses.
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Blocking angles are probably the most overlook aspect of the offensive line. Coaches tend to have just a base blocking scheme (one on one). Taking advantage of blocking angles on the defensive linemen (crack, down, cross, and kick out) will make for a much easier/effective block for linemen. The cross block is very easy to execute; works well against all types of defenses.