Formation

An arrangement of the offensive skill players. A formation usually is described in terms of how the running backs line up (e.g. I formation, which refers to the half back is lined up about 7 yard deep, and the fullback is lined up about 5 yards deep, both directly behind the quarterback) or how the wide receivers line up (e.g. Trips left, in which three wide receivers line up to the left of the linemen). Frequently, the formation will allude to both, such as with Strong I Slot Right, in which the halfback is lined up 7 yards deep behind the quarterback, the fullback is 5 yards deep behind the guard or tackle on the strong side, and both wide receivers are lined up on the right side of the offensive line. There are rules limiting what is legal in a formation. All five offensive linemen must be on the line of scrimmage (a small amount of leeway is given to tackles when lined up for pass protection). Also, there must be one receiver (usually one tight end and one wide receiver) lined up on the line on either side of the offensive linemen (it doesn’t matter how close they are to the tackles, as long as they are on the line), with a total of no fewer than seven players on the line, 5 of which must be numbered between 50-79. A numbering exception exists if the offense is in a scrimmage kick formation which allows a player whose number is 1-49 or 80-99 to take the place of a lineman numbered 50-79. A receiver who is on the line may not go in motion.