re: Sports Science guy on Fournette: Can create same momentum as 500-lb tiger

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I have literally never heard of someone being too fast. Perhaps he is trying to say that running too fast creates a ton of shearing force on tendons and ligaments when a back tries to cut at full speed?

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I think you're on the right track.

If you watch the 30 for 30 about Bo Jackson, it mentions his size, strength and speed were to much for his body. Dr. Andrews blames that for the severe injury to his hip on such a routine play. The force exerted on his leg was to much for the hip to handle when he planted his foot and was taken down.