Rokushiki Robin 17 by Shinjojin on DeviantArt

Is Rokushiki a fighting style? If it is, does Luffy use it? - Quora

Rokushiki, Wiki

Rokushiki Robin 33 by Shinjojin on DeviantArt

World of Shinjoin! — Rokushiki Robin UPDATE 4/16/17: 1 technique

Kami-e, One Piece Role-Play Wiki

The Nico Robin: Rokushiki Style Project - Tetsuhana HanaRin(Iron flower Flower wheel) - This is Robin's very own take on the Tekkai Rin (Iron mass Wheel) technique that's similar to the original

Explaining ROKUSHIKI Techniques

Rokushiki, One Piece Wiki

One Piece 1069: How strong is Rob Lucci now?

Rokushiki is based on physical strength is actually based on a mistranslation in earlier One Piece volumes : r/OnePiece