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Hitosashiyubi ipponken (人差し指一本拳)

Introduction

Hitosashiyubi ipponken (人差し指一本拳) is a hand form in which the striking surface is formed by the protruding second joint of the index finger.

It is used in thrusts and in downward strikes.

Definition

Hitosashiyubi ipponken (人差し指一本拳)
A hand form in which the second joint of the index finger is pushed forward and forms the striking surface.

Terminology

Japanese: 人差し指一本拳
Romaji: hitosashiyubi ipponken
English: index-finger one-knuckle fist

Structure / Form

Basic position

  • the hand is clenched as a compact fist
  • the back of the hand is turned upward

Index finger

  • the second joint of the index finger is pushed forward
  • it forms the foremost point of the striking surface

Thumb

  • the thumb is pressed against the side of the index fingernail
  • it locks the hand form

Wrist

  • the wrist is kept straight
  • the hand and forearm are kept in line

Striking surface

Primary contact

  • the protruding second joint of the index finger

Secondary contact (should be avoided)

  • the other knuckles
  • fingers
  • palm

Basic principles

Structure

The hand form is kept compact so that the second joint of the index finger is clearly exposed as the striking surface.

Body connection

Power is transferred through the body to the striking surface.

English:
ground → leg → hip → torso → shoulder → arm → striking surface

Japanese / romaji:
jimen (地面) → ashi (足) → koshi (腰) → dōtai (胴体) → kata (肩) → ude (腕) → datotsu-bu (打突部)

Kime (決め)

Power is concentrated at the moment of impact.

Execution

Movement

  • the technique starts without unnecessary tension
  • the movement is driven by the coordination of the body
  • the hand follows a clear path toward the target

Impact

  • contact occurs with the second joint of the index finger
  • the hand form is kept stable throughout the impact

Retraction

  • the hand is pulled back directly after impact

Use

Hitosashiyubi ipponken is used in:

  • thrusts
  • downward strikes

Common targets are:

  • lower rib area
  • below the nose
  • center of the forehead
  • throat

Training

Hitosashiyubi ipponken is trained through:

  • kihon
  • controlled repetitions
  • precision training

Focus:

  • correct hand form
  • clear striking surface
  • stable thumb position
  • straight wrist

Common errors

Incorrect knuckle

  • contact occurs with the wrong part of the hand
  • the technique loses precision

Incorrect thumb position

  • the hand form is not locked correctly
  • the structure becomes unstable

Unstable structure

  • the hand collapses at the moment of impact
  • power is transferred less effectively

Bent wrist

  • breaks the alignment
  • weakens the impact

Summary

Hitosashiyubi ipponken (人差し指一本拳) is a hand form in which the second joint of the index finger forms the striking surface.

It is defined by:

  • protruding second joint of the index finger
  • thumb pressed against the side of the index fingernail
  • the back of the hand turned upward
  • straight wrist