In gridiron football, motion refers to the movement of an offensive player at the time of the snap. While there are different rules regarding motion, most...

Gridiron football (/ˈɡrɪdaɪərn/ GRID-iren), also known as North American football, or in North America as simply football, is a family of football team...

A tackle is a playing position in American football. Historically, in the one-platoon system prevalent in the late nineteenth and early twentieth centuries...

In gridiron football, a penalty is a sanction assessed against a team for a violation of the rules, called a foul. Officials initially signal penalties...

A fullback (FB) is a position in the offensive backfield in gridiron football and is one of the two running back positions along with the halfback. Fullbacks...

Motion (born 1964), England-born American horse trainer Motion (gridiron football), movement by an offensive player at the start of a play The Motion...

"snapback", or "pass from center") is the backward passing of the ball in gridiron football at the start of play from scrimmage. The ball begins on the ground...

snap must be a continuous motion. If a center halts the snap motion, this draws the penalty of "illegal snap". In college football, the Dave Rimington Trophy...

In gridiron football, a lineman is a player who specializes in play at the line of scrimmage. The linemen of the team currently in possession of the ball...

awarded a new set of downs. Although spear tackles are allowed in gridiron football, a player may not use his helmet to tackle an opponent as the technique...