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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.
Diagram of a modern American football field. Diagram of an early 20th century version of an American football field. The rectangular field of play used for American football games measures 100 yards (91.44 m) long between the goal lines, and 160 feet (48.8 m) (53.3 yards) wide. The field may be made of grass or artificial turf. In addition ...
A route tree for a receiver on the left side of the offense. A route is a pattern or path that a receiver in gridiron football runs to get open for a forward pass. [1] Routes are usually run by wide receivers, running backs and tight ends, but other positions can act as a receiver given the play.
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. The device was named for its inventor, George Dicker (1913–1989) [ 1 ] of Tustin, California , [ 2 ] and received a patent in 1973. [ 3 ]
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 ...
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All events within the sport are forms of running, walking, jumping or throwing. These events are divided into the sub-sports of track and field, road running, racewalking and cross country running. The Olympic athletics programme has played a significant role in shaping the most common events in the sport.
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