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The chain gang. In gridiron football, the chain crew (commonly known as the "chain gang") is a crew that manages signal poles on one of the sidelines.There are three primary signal poles: the "rear rod" that marks the beginning of the current set of downs, the "forward rod" that marks the line to gain, and the "box" that marks the line of scrimmage.
The entire field is a rectangle 360 feet (110 m) long by 160 feet (49 m) wide; covering a total of 1.32 acres. [1] The longer lines are the sidelines and the shorter lines are called end lines. NFL rules call for the sidelines and end lines to be 6 feet (1.8 m) wide, though the lines may be narrower on fields used for multiple sports or by ...
A sideline official holding a dicker-rod during the 1974 World Football League season; running with the football is quarterback Dave Mays. The dicker-rod (also spelled dickerod) is a device intended to replace the first down chains commonly used to measure 10-yard distances during games of gridiron football.
Per the league, a tracking system is installed at every NFL stadium that includes "20-30 ultra-wide band receivers," "2-3 radio-frequency identification (RFID) tags installed into the players ...
Gridiron football (/ ˈ ɡ r ɪ d aɪ. ər n / GRID-eye-ərn), [1] also known as North American football, [2] or in North America as simply football, is a family of team sports derived from rugby football (and football, by extension) primarily played in the United States and Canada.
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In football, the formation describes how the players in a team are positioned on the field. Many variations are possible on both sides of the ball, depending on the strategy being employed. On offense, the formation must include at least seven players on the line of scrimmage , including a center to start the play by snapping the ball.
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