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Originally Posted by Welpe
Speaking NFHS rules:
The free blocking zone is three yards deep and four yards wide on each side of the football, which makes its total size 6 yards deep by 8 yards wide. A player is considered in the free blocking zone if only a portion of his person is in the zone. The offense may NOT chop block a defender at any time.
There can be a block below the waist by either the offense or defense as long as A) both players are in the free blocking zone at the snap, B) both players were on the LOS at the snap, C) the block occurs in the free blocking zone and D) the ball is still in the free blocking zone.
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Just a refinement. Offensive players MUST be on the line of scrimmage at the snap to clip, block below the waist or in the back. Defensive players MUST be on the line of scrimmage to be blocked or to block below the waist and be clipped. Defensive players can be blocked in the back if they are in the free blocking zone.
Remember, the defensive line, by definition, is one yard beyond the neutral zone, so, when the book reads defensive line that is one yard.