<P> Scoring--6 points for TD, 2 points for run or pass conversion, or drop kick PAT, 1 point for place kick PAT, 2 points for defensive conversion following TD, 2 points for safety . 3 points for a field goal, 4 points for a drop kick field goal . </P> <P> Backfield in Motion--One player may be in motion in any direction behind the line of scrimmage prior to the snap . </P> <P> Offensive Linemen--Three linemen must be in a three - or four - point stance prior to the snap . They must line up guard, center, guard and next to one another . Any offensive lineman not covered up by the fourth man on the line of scrimmage is an eligible receiver if he is wearing an eligible receiver number (1 - 49, 80 - 89). </P> <P> Defensive Linemen--There must be three defensive linemen, and they must line up on the nose, or can line up inside foot - to - outside foot outside of an offensive lineman Linemen must rush inside if nose up or slanted into if shaded, and they must make contact before any movement to the outside is made . </P>

How long does it take to sprint a football field