腰の回転
Koshi no kaiten
Waist rotation exercise

 

Yoi (prepatory posture)

 

Rotate to one side, return and pause at yoi, then rotate to the other

 

Koshi no kaiten is the second exercise in the kihon renshū of Shōrin ryū Seibukan

Shimabukuro Zenshun 島袋善俊

Zenpō Shimabukuro and Dan Smith, Shorin ryū Seibukan: Kyan's Karate