Quote:
Originally Posted by cmathews
Hurdling is a safety concern. Not for the hurdler but rather for the hurdlee...The knees cause a lot of damage when they crash into a helmet, therefore to try and prevent injury to (usually defenders) hurdling is not allowed. The definitions are there to make sure that the knees are leading as that is what causes the injuries.
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I'd always assumed it was to protect the head of the hurdlee from the likelihood of the hurdler's failing to clear the hurdlee, and therefore hitting the hurdlee's head with his crotch at high speed.