Iron Body...

As for style specific, I believe that Hung Gar and possibly some of the Northern Chinese styles use it. The one you might want to contact for more information on this would be Master Wing Lam. He is one of the foremost experts on this style of training that I know of.
 
I probably have the spelling wrong on this, but you might also want to look into Ueichi Ryu Karate.

Jeff
 
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