The fundamental difference between the application of Shuto Uchi and Tettsui Uchi lies in their target areas and intended effects: Shuto Uchi targets vital points like the neck or collarbone to cause sharp pain and disrupt the opponent's structure, while Tettsui Uchi targets broader areas like the head or ribs to cause blunt force trauma and disorientation. Shuto Uchi, or knife-ha....
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