Rule 7-1
ARTICLE 4. a. If a snap is preceded by a huddle or shift, all players of the offensive team must come to an absolute stop and remain stationary in their positions, without movement of the feet, body, head or arms, for at least one full second before the ball is snapped (A.R. 7-1-4-I) [S20].
b. It is not intended that Rule 7-1-4-a should prohibit smooth, rhythmical shifts if properly executed. A smooth cadence shift or unhurried motion is not an infraction. However, it is the responsibility of an offensive player who moves before the snap to do so in a manner that in no way simulates the beginning of a play. After the ball is ready for play and all players are in scrimmage formation, no offensive player shall make a quick, jerky movement before the snap, including but not limited to (A.R. 7-1-4-II-IV):
1. A lineman moving his foot, shoulder, arm, body or head in a quick, jerky motion in any direction [S19].
2. The snapper shifting or moving the ball or moving his thumb or fingers, flexing his elbows, jerking his head, or dipping his shoulders or buttocks [S19].
3. The quarterback “chucking’’ his hands at the snapper, flexing his elbows under the snapper, jerking his head or dropping his shoulders quickly just before the snap [S19].
4. A player, before the snap, simulating receiving the ball by “chucking’’ his hands toward the snapper or quarterback or making any quick, jerky movement that simulates the beginning of a play [S19].