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Originally, a full-back was the last line of defence, but as the game developed in the early 20th century, the centre-half role was dropped backwards and came to be known as 'centre-back', and the full-backs were then pushed out wider to create the right-back and left-back positions. [31]
This position is used in 3-4 formations, or goal line situations. Most nose tackles are 320-350 pounds, and are the biggest players on the roster. This position is the most physically demanding, due to being forced into constant double or triple teams, and needing enough speed to collapse the interior of the offensive line.
The full-backs (the left-back and the right-back) locate the holding wide positions and traditionally stay in defence at all times, until a set-piece. There is one full-back on each side of the field except in defences with fewer than four players, where there may be no full-backs and instead only centre-backs.
The so-called center and fullback are playing left and right versions of the same position. The positions were later renamed "linebacker". However, that did not become the usual way to name that position until platoon football became common, with players specializing in offense or defense, substituted according to which team has the ball. There ...
Back Willie Heston of Fielding Yost's "point-a-minute" Michigan team has been acknowledged as the first to play at what later was designated as the tailback position on offense. Before Heston, left halfbacks ran plays in one direction, and right halfbacks ran plays in the other direction.
In American football, only one offensive player can be in motion at a time, cannot be moving toward the line of scrimmage at the snap, and may not be a player who is on the line of scrimmage. In Canadian football, more than one back can be in motion, and may move in any direction as long as they are behind the line of scrimmage at the snap.
A running back turns up the field in an attempt to reach the end zone.. The halfback (HB) or tailback (TB) position is responsible for carrying the ball on the majority of running plays, and may frequently be used as a receiver on short (or sometimes long, depending on the system) passing plays.
The cornerback position requires speed, agility, strength, and the ability to make rapid sharp turns. A cornerback's skill set typically requires proficiency in anticipating the quarterback, backpedaling, executing single and zone coverage, disrupting pass routes, block shedding, and tackling. Cornerbacks are among the fastest players on the field