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Chūsoku (中足)

Introduction

Chūsoku (中足) is the primary striking surface of the foot in Kyokushin karate.

It is used in basic kicks (keri, 蹴り), where contact occurs with the front part of the sole of the foot.

Definition

Chūsoku (中足)
A striking surface where contact occurs with the front part of the sole of the foot, that is, the ball of the foot under the toes.

Terminology

Japanese: 中足
Romaji: chūsoku
English: ball of the foot / front ball of the foot

Structure / Form

Starting point

  • the foot is kept relaxed
  • the toes are naturally extended

Toes

  • the toes are drawn back as far as possible
  • the ball of the foot is exposed as the striking surface

Ankle

  • the ankle is kept stable
  • the foot is kept aligned through the impact

Striking surface

Primary contact

  • the front ball of the foot under the toes

Secondary contact (should be avoided)

  • toes
  • middle of the foot

Basic principles

Structure

The foot is kept together so that the ball of the foot becomes clear as the striking surface.

Body connection

Power is transferred through the body to the striking surface.

English:
ground → supporting leg → hip → torso → kicking leg → foot → striking surface

Japanese / romaji:
jimen (地面) → sasae-ashi (支え足) → koshi (腰) → dōtai (胴体) → keri-ashi (蹴り足) → ashi (足) → 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 foot is carried in along a clear kicking path

Impact

  • contact occurs with the ball of the foot
  • the toes are kept retracted at the moment of impact
  • the ankle is kept stable through the impact

Retraction

  • the leg is pulled back directly after impact

Use

Chūsoku is used, among other things, in:

  • mae geri (前蹴り)
  • mae geri age / jōdan mae geri
  • mawashi geri (回し蹴り)

Common targets are:

  • abdomen
  • solar plexus
  • chin
  • ribs

Training

Chūsoku is trained through:

  • kihon
  • controlled kicks
  • precision training against light targets

Focus:

  • correct striking surface
  • retracted toes
  • stable ankle
  • clear impact line

Common errors

Impact with the toes

  • incorrect striking surface
  • increased risk of injury

Insufficiently retracted toes

  • the ball of the foot is not exposed correctly
  • the striking surface becomes weaker

Unstable ankle

  • breaks the structure
  • reduces force transfer

Poor retraction

  • the technique loses speed
  • balance deteriorates

Summary

Chūsoku (中足) is a striking surface where the ball of the foot is used.

It is defined by:

  • retracted toes
  • stable ankle
  • impact with the front ball of the foot
  • quick retraction