The Discovery Channel had a special on the 10 deadliest martial arts.?

curious

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The Discovery Channel had a special on the 10 deadliest martial arts. What is the name of the martial art developed by the American and what is his name?
It's not Ed Parker, it more recent maybe from the 1970's or 80's. He is a Caucasian male. His art was around number 10 on the list. I was impressed not by the defense but the offense. His training makes his students almost impervious to pain. His student demos were a guy getting kicked in the groin and not flinching and another demo had a guy getting punched in the neck front, back and both sides at full contact by four black belts and taking it.
 
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