Gridiron football
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Gridiron football, is a family of team sports derived from rugby football primarily played in the United States and Canada.
A 1904 diagram of an American football field. In this period, lines were painted along the length of the field as well as the width, making a grid pattern.
Commonwealth Stadium in Edmonton, with a Canadian Football League game in progress
Out of bounds
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In sports, out of bounds is the state of being outside the playing boundaries of the field. The legality of going out of bounds, and the ease of prevention, vary by sport. Sports that use this term in
In gridiron football, a player who steps onto the sidelines during play is considered to be out of bounds. The horizontal white stripe near the bottom of this picture denotes the boundary, with legal play occurring above it.
Players not actively participating in a game and coaches remain on the sidelines during play