American football Line of scrimmage

In American and Canadian football, a line of scrimmage is an imaginary transverse line (across the width of the football field) beyond which a team cannot cross until the next play has begun. Its location is based on the spot where the ball is placed after the end of the most recent play and following the assessment of any penalty yards.

A line of scrimmage is parallel to the goal lines and touches one edge of the ball where it sits on the ground prior to the snap. Under NFL, NCAA, and NFHS rules, there are actually two lines of scrimmage at the outset of each play: one that restricts the offense and one that restricts the defense. The area between the two lines (representing the length of the ball as extended to both sidelines) is called the neutral zone. Only the center, the offensive player who snaps the ball, is allowed to have any part of his body in the neutral zone. In order for there to be a legal beginning of a play, a certain number of the players on the offensive team, including certain eligible receivers, must be at, on or within a few inches off their line of scrimmage.

In Canadian football, the team on defense must line up no nearer than a yard to the line of scrimmage. In American football, they must only be beyond the line.

Many fans and commentators refer colloquially to the entire neutral zone as the "line of scrimmage," although this is technically not correct. Others use the general term to refer specifically to the defensive line of scrimmage, since it is the line relevant to the measurement of progress toward the goal. Referees, when explaining a penalty, will refer to "the previous spot" instead of the "line of scrimmage" in order to avoid confusion.

Modern video techniques enable broadcasts of American football to display a visible line on the screen representing the line of scrimmage. The line is tapered according to camera angle and gets occluded by players and other objects as if the line were painted on the field. The line may represent the line of scrimmage or the minimum distance that the ball must be moved for the offensive team to achieve a first down.

SPORTS

American Football

Game play in American football consists of a series of downs, individual plays of short duration, outside of which the ball is dead or not in play. These can be plays from scrimmage – passes, runs, punts, or field goal attempts (from either a place kick or a drop kick) – or free kicks such as kickoffs and fair catch kicks. Substitutions can be made between downs, which allows for a great deal of specialization as coaches choose the players best suited for each particular situation. During a play, each team should have no more than 11 players on the field, and each of them has specific tasks assigned for that specific play.