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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Even if you’re on the right track, you’ll get run over if you just sit there. - Will Rogers
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