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Nihonken (二本拳)

Introduction

Nihonken (二本拳) is a hand form in which the striking surface is formed by two protruding knuckle joints.

It constitutes a combination of hitosashiyubi ipponken and nakayubi ipponken.

Definition

Nihonken (二本拳)
A hand form in which the second joints of the index finger and middle finger are pushed forward and form the striking surface.

Terminology

Japanese: 二本拳
Romaji: nihonken
English: two-knuckle fist

Structure / Form

Basic position

  • the hand is clenched as a compact fist
  • the index finger and middle finger are formed so that their second joints are pushed forward
  • the other fingers are kept closed

Thumb

  • the thumb locks the fist
  • the hand form is kept stable through thumb support

Position

  • two protruding joints form the striking surface
  • the hand is kept compact and controlled

Wrist

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

Striking surface

Primary contact

  • second joint of the index finger
  • second joint of the middle finger

Secondary contact (should be avoided)

  • the other parts of the fist
  • fingers
  • palm

Basic principles

Structure

The hand form is kept compact so that the two protruding joints become clear 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 two protruding joints
  • the impact is carried in in a controlled way with a stable structure

Retraction

  • the hand is pulled back directly after impact

Use

Nihonken is used in:

  • thrusts
  • strikes from above

The technique has the same basic use as hitosashiyubi ipponken and nakayubi ipponken.

Training

Nihonken is trained through:

  • kihon
  • controlled repetitions
  • precision training

Focus:

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

Common errors

Uneven striking surface

  • the joints are not projected evenly forward
  • the impact becomes unstable

Unstable structure

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

Incorrect striking surface

  • contact occurs with other parts of the fist
  • the technique loses precision

Bent wrist

  • breaks the alignment
  • weakens the impact

Summary

Nihonken (二本拳) is a hand form in which the second joints of the index finger and middle finger form the striking surface.

It is defined by:

  • two protruding joints
  • compact fist structure
  • stable thumb lock
  • straight wrist