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From an injury perspective: What are they? Let's assume we're talking MS/HS football where the mass of the players is enough to really do some damage.

Provide your data Mr. Thrwaway, if that even is your real name.

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I have understood that in general any type of sudden acceleration and deacceleration is enough to cause potential damage. So it is just not the hard hits it is any situations which brain moves against the skull. Over long enough period these will add up and cause cumulative damage.

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