Where do I spot the ball?

• Across the field: spot the ball in the middle of the field before the ready-to-play whistle. If the offense asks before the ball is ready for play, you can move it toward a sideline, but never closer than 10 yards to a sideline.
• After a flag pull: where the ball is when the flag is pulled (not where the runner's feet are).
• Flag falls off: where the flag lands.
• Out of bounds: stepping on the boundary line is out of bounds.
• Snap, pitch or lateral hits the ground: where the ball hit the ground.
• Illegal jump, leap or hurdle: where it happened.
• Pass clock expires: back to the previous line of scrimmage; the down counts.
• New possessions: the offense's own 5-yard line, except after an interception or a failed 4th-down "play" short of midfield (where the play ended).
• Tries: the 5-yard line (1 point) or 10-yard line (2 points).

The line-to-gain is midfield. No-run zones are the 5 yards before midfield and before each goal line.