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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.
A 4–3 base defense. In American football, a 4–3 defense is a defensive alignment consisting of four down linemen and three linebackers.It is called a "base defense" because it is the default defensive alignment used on "base downs" (1st and 2nd downs).
One is by removing a linebacker from the standard 4–3 to add the extra defensive back. The second is by converting the ends of a wide tackle six to safeties (the defensive ends of a wide tackle six already have pass defense responsibilities). [49] [50] [51] A variation is the 2–4–5, which is primarily run by teams that run the 3–4 ...
The 4-3 defense has 2 tackles and 2 ends; the 3-4 defense has 2 ends and 1 tackle, who is sometimes called a nose tackle (NT) to indicate the 3-4. Tackles line up inside and rely on power to stop the run, while ends line up outside and are faster and more athletic to allow them to pursue the quarterback.
The 3–4 outside linebackers resemble "stand-up ends" in the older defense. It is sometimes pronounced thirty-four defense. The 3–4 also was spun off from the Miami Dolphins' "52 defense" named for the jersey number worn by linebacker Bob Matheson, who was often used by the Dolphins as a fourth linebacker in passing situations. 4–3 defense
Offenses and defenses continued to adapt to the increases in forward passing favored by the rules. Below is diagrammed a 3-4-4 (or simply "3-4") defensive formation and an offensive formation it might line up against across the lines of scrimmage, as popular beginning in later portions of the 20th century: FS SS
In the 3–4 defense, defensive ends are used primarily as run stoppers and are much larger than the normal size of a player at this position. Often, the position is played by a more agile or slightly undersized defensive tackle. Because of the increased popularity of the 3–4 defense, the value of a defensive tackle prospect that can possibly ...
By far the most common alignments are four down linemen and three linebackers (a "4–3" defense) or three down linemen and four linebackers ("3–4"), but other formations such as five linemen and two linebackers ("5–2") or three linemen, three linebackers, and five defensive backs ("3–3–5") are also used by a number of teams.