American football positions four linebackers, and four defensive backs (two cornerbacks, a strong safety, and a free safety) Special teams are units that are on the field during kicking plays. While many players who appear on offensive or defensive squads also play similar roles on special teams (offensive linemen to block, or defensive players to tackle) there are some specialist roles which are unique to the kicking game. American football positions In American football each team has 11 players on the field at one time. The specific role that a player takes on the field is called his position. Under the modern rules
American football field American football field American football games are played on a rectangular "Field of Play" that measures long between goal lines, and () wide. In addition, there are end zones extending another past the goal lines to the "end lines", for a total length of . When the "football field" is used as unit of measurement, it is usually understood to mean , although technically the full length of the official field, including the end zones, is . White markings on the field identify the distance from the end zone. Inbound lines, or hash marks, are short parallel lines that mark