Shinja Kai is a hybrid system drawing from roots in Judo, Jujustu, JKD, Wing Chun and Karate, as well as Filipino Martial Art (Arnis, Escrima & Kali), Kuntao, Silat, Muay Thai, Muay Boran, Russian Martial Art (Systema and ROSS), Western Boxing, BJJ, Freestyle and Greco-Roman Wrestling and others.
Darby Defense is designed aroung the inverted pyramid of instruction: the most vital and important life-preserving elemnts are taught first. The focus is around short-term rapid learning, in contrast to Shinja Kai which is for life-long learners.
