The high school star running back runs down the field, he gets to the 40, a man is in his way, so he takes a flying leap, clearing the defender, and resumes his sprint to the end zone. The referee's whistle blows, the play is dead, and the offense is penalized 15 yards for an illegal contact foul.
It seems to me that the only person with even a potential of getting hurt is the offensive player, but hurdling is still much less dangerous than the receiver who jumps for a pass and is drilled by the safety.
Why would they make hurdling illegal?
P.S. It ruins a ton of amazing plays :(