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  2. Shift (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Shift_(gridiron_football)

    A team may shift any number of players into new positions, so long as they all come to a complete stop for a full second before the ball is snapped to start the play. The National Football League (NFL) defines all motion and shift penalties as "illegal motion", [1] while both the NCAA and NFHSAA make a distinction between an "illegal shift" and ...

  3. Motion (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Motion_(gridiron_football)

    The National Football League defines all motion and shift penalties as "illegal motion", [7] while both the NCAA and NFHSAA make a distinction between an "illegal shift" and "illegal motion"; an illegal shift refers to players shifting and not coming to a complete stop before the snap, while illegal motion refers to a player who is in motion towards the line of scrimmage, or a player who is ...

  4. Penalty (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Penalty_(gridiron_football)

    Any player who moves after he has gotten in his set position before the snap in a way that simulates the start of the play. Called "[illegal] procedure" in the CFL. Two arms in front of chest horizontally with closed fists "rolling" around each other (same signal that basketball referees use to signal traveling). 5 yards: 5 yards: 5 yards: 5 yards

  5. List of gridiron football rules - Wikipedia

    en.wikipedia.org/wiki/List_of_gridiron_football...

    A standard football game consists of four 15-minute quarters (12-minute quarters in high-school football and often shorter at lower levels, usually one minute per grade [e.g. 9-minute quarters for freshman games]), [6] with a 12-minute half-time intermission (30 minutes in the Super Bowl) after the second quarter in the NFL (college halftimes are 20 minutes; in high school the interval is 15 ...

  6. Illegal procedure - Wikipedia

    en.wikipedia.org/wiki/Illegal_procedure

    Some penalties are signalled with a generic "illegal procedure" signal. [1] Examples are: False start; Illegal formation; Kickoff or safety kick out of bounds; Player voluntarily going out of bounds and returning to the field of play on a punt; Some examples of similar penalties have their own signals. Examples include: Illegal shift; Illegal ...

  7. False start - Wikipedia

    en.wikipedia.org/wiki/False_start

    In American football and Canadian football, a false start is movement by an offensive player (other than the center) after he has taken a set position.For offensive linemen, this movement might be as minimal as a couple of centimeters, although the rule's intent is to prevent offensive players from unfairly drawing the defense offside.

  8. NFL video of now illegal tackle included a special focus on a ...

    www.aol.com/nfl-video-now-illegal-tackle...

    Other than having games take place on artificial fields, the NFL says it is dedicated to improving player safety. That’s the reason why the NFL on Monday outlawed the hip-drop tackle because it ...

  9. Tackle (football move) - Wikipedia

    en.wikipedia.org/wiki/Tackle_(football_move)

    Grabbing a ball carrier by the pads behind his neck and pulling him down is known as a "horse collar", a method which has been made illegal at all levels of American football. It is also illegal to tackle a player who has thrown a forward pass (generally a quarterback) after he has released the ball; doing so is called "roughing the passer" and ...