Haitō (背刀)

Introduction

Haitō (背刀) is a striking surface using the inner edge of the hand at the base of the thumb.

The hand remains open and the thumb side forms the striking surface. Haitō is used in strikes (uchi, 打ち).

Definition

Haitō (背刀)
A striking surface in which contact is made with the inner edge of the hand at the base of the thumb.

Terminology

Japanese: 背刀
Romaji: haitō
English: ridge hand / inner hand edge

Structure / Form

Starting position

• the hand is open
• the fingers extend straight forward
• the hand is held flat

Thumb

• the thumb folds under the hand
• it stays close against the palm

Position

• the inner edge of the hand forms the striking surface
• the thumb side is directed toward the target

Wrist

• the wrist is kept straight
• hand and forearm remain aligned

Striking surface

Primary contact

• inner edge of the hand at the base of the thumb

Secondary contact to avoid

• thumb
• fingers
• palm

Basic principles

Structure

The hand remains open, flat and unified so the inner edge is stable as a striking surface.

Body connection

Force is transferred through the body to the striking surface.

English:
ground → legs → hips → trunk → 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)

Force is concentrated at impact.

Execution

Movement

• the technique begins without unnecessary tension
• movement is driven by coordinated body action
• the hand follows a directed path toward the target

Impact

• contact is made with the inner edge at the base of the thumb
• the technique may be used with the palm facing either up or down

Recovery

• the opposite hand retracts into hikite (引き手)
• the working arm retracts immediately after impact

Use

Haitō is used, among other applications, in strikes to the head area.

Example:

• haitō uchi (背刀打ち)

Training

Haitō is trained through:

• kihon
• repetitions
• controlled striking practice

Focus on:

• correct striking surface
• correct thumb position
• flat hand form
• straight wrist

Common errors

Incorrect thumb position

• the thumb becomes exposed
• the hand form breaks
• injury risk increases

Incorrect striking surface

• contact is made with the thumb, fingers or palm
• the impact becomes unstable

Bent wrist

• breaks alignment
• weakens the strike

Loose hand form

• the hand is not held flat
• the striking surface becomes unclear

Summary

Haitō (背刀) uses the inner edge of the hand at the base of the thumb.

It is defined by:

• open, flat hand
• thumb folded under the hand
• thumb held against the palm
• impact with the inner thumb-side edge
• straight wrist