後ろ捻り突き
Ushiro hineri tsuki
Backwards twisting punch

 

Ushiro hineri tsuki yōi
Naihanchi dachi
  Side view

Ushiro hineri tsuki is one of the exercises of Shōrin ryū Seibukan kihon renshū.

Shimabukuro Zenshun 島袋善俊

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