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40 Tekubi undō / Seiken no keisei

Name

Romaji:
Tekubi undō / Seiken no keisei

Japanese:
手首運動・正拳形成

English:
Wrist rotation and fist formation

Romaji instruction

Hai, shisei o tadashite.
(Correct posture)

Hai, migi sanchin dachi.
(Move to right sanchin dachi)

Hai, kamaete.
(Prepare)

Migi no tekubi o motte.
(Hold the right wrist)
Migi ude o agete.
(Raise the right arm)

Tekubi o mawashite.
(Rotate the wrist)
Ichi, ni, san, shi, go, roku, shichi, hachi.

Hai, hantai.
(Opposite direction)
Ichi, ni, san, shi, go, roku, shichi, hachi.

Hai, seiken o tsukutte.
(Form the fist)
Gutto nigitte, chikara o irete.
(Clench tightly and apply tension)

Hai, futte.
(Shake loose)

Hai, hidari.
(Switch to left)

(Repeat same sequence)

Hai, naore.
(Return)

Counting

Ichi – Ni – San – Shi – Go – Roku – Shichi – Hachi
(Performed in both directions per hand)

Description

The practitioner stands in migi sanchin dachi, creating a stable and engaged base.

One hand holds the opposite wrist (tekubi).

The wrist is rotated: - eight times in one direction
- eight times in the opposite direction

After this, the hand forms a proper seiken (fist): - fingers tightly closed
- thumb locked over index and middle finger
- first two knuckles aligned forward
- wrist kept straight

The fist is strongly contracted and then relaxed by shaking the hand.

The exercise is repeated on the opposite side.

Purpose

  • mobilize the wrist joint (tekubi)
  • strengthen the forearm and grip
  • develop correct seiken structure
  • improve stability in striking techniques
  • connect lower body (sanchin) with upper body

This exercise marks the transition toward technical activation of striking mechanics.

Technical key points

  • straight wrist
  • correct knuckle alignment
  • tension → relaxation
  • stable sanchin base
  • controlled rotation

Comment

Seiken no keisei (正拳形成) means “formation of the correct fist” and is the most precise term in this context.

This exercise represents a transition toward kihon-level technique.