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Naifu-kinniku (literally: “knife-and-muscles”) is a variant of the outside shutō block, which is apparently unique to Goshin-Jutsu. Whereas outside shutō blocks are linear, two-beat motions (i.e, ♫, “1-2”), naifu-kinniku is a circular, one-beat motion (i.e., ♪, “1”), which makes them intrinsically faster. This is because a naifu-kinniku consists of two simultaneous motions:

  • The opposite-side hand swats the opponent’s technique aside with a pressing block variant which follows an outside-to-inside circular path, as though you were sanding a floor. Since this “pre-block” is more of a slap or swat, it does not require the pressing block’s hip counter-rotation.
  • The same-side hand follows an inside-to-outside circular path, like waxing a car, and ends with your same-side shutō contacting the opponent.
[video of a naifu-kinniku, fast and slow, from the front and side]

Timing is critical to avoid crossing your arms. Crossing your arms always creates a vulnerability, because a fast and observant opponent can push on your lead arm to pin both of your arms to your chest, leaving you momentarily helpless.