This is the Chinese art of point striking. 

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It is not magic, but simply teaching you a very in depth knowledge of where the weakest points are on the body. Just learning where the points are however will not help you in self defence, your Dim-Mak training is about training your subconscious to strike to these points with out thinking, and most importantly, learning how to get past your attackers guard, and how to strike. If you can't fight, Dim-Mak won't work.

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You can read more about Dim- Mak here.