Hammerfist strike

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Tettsui-uchi (literally: “iron hammer strike”), or hammerfist strike earns its name because it requires you to imagine that the shutō of closed fist is the head of a sledgehammer.

Hammerfists are incredibly simple and robust, and they are the weapon of choice when delivering crushing blows to the hardest parts of your opponent’s anatomy, like the jaw, the temple, or even the skull itself. Hammerfists are versatile, and can be thrown in can be thrown in four directions.

Downward hammerfist strike

The downward hammerfist strike is a brutal, closed-fist variation of hassō-shutō-uchi.

[videos of inside hammerfists, fast and slow from the front and from the side.]

Inside hammerfist strike

The inside hammerfist strike is a brutal, closed-fist variation of tate-shutō uchi.

[videos of inside hammerfists, fast and slow from the front and from the side.]

Outside hammerfist strike

The outside hammerfist strike is a brutal, closed-fist variation of the winding knife-hand strike, makkikomi-shutō uchi.

[videos of outside hammerfists, fast and slow from the front and from the side.]

Downward hammerfist strike

Downward hammerfist strikes are used to deliver crushing blows to your opponent’s abdomen and genitalia, typically when escaping from an attacker who has grabbed you from behind.

To throw a downward hammerfist strike, pull your arm back sharply, as far as possible. (Ideally, this is a rear elbow strike.) Then, straighten the arm out and down in a snapping motion. The forearm should not swing freely while the elbow remains fixed in place, like a folding pocket knife. The elbow should drop down as you perform a downward hammerfist, giving it the same crack-the-whip feeling as an outside hammerfist or a winding knife-hand strike,

[videos of downward hammerfists, fast and slow from the front and from the side. Also, show a bad example where the fists swings uselessly from the side, and shout “NO!” or something.]”