Renshi Bak's initial martial arts experience goes back to the fall of 1971, in Noranda, Quebec. There he was introduced to Judo and a seed was planted.

      In 1976 Bak sensei became acquainted with sensei Herb Hoenig and the art of Goju-Ryu Karate. The dojo was in the town of Kincardine, Ontario and was one of only three dojos (Toronto, Pettawawa) belonging to the Canada Goju Karate Association. In 1980, thanks to the support of sensei Dennis (Rock) Fry, Bak sensei received his shodan in Goju-Ryu karate from Bill Hind Kyoshi.

     In 2000 Bak sensei met George Dillman sensei and Steve Stewart sensei and began the study of Kyusho Jitsu. In 2003 Bak sensei was awarded his nidan in Kyusho.

     Renshi John Bak presently holds the ranks of roku dan (6th degree) in Goju-Ryu Karate and sandan (3rd degree) in Kyusho Jitsu. Bak sensei is also an accomplished instructor in Kobudo (Weapons) where upon he studies the Matayoshi system of kobudo.

     During a very short but active competitive career Bak sensei placed in the top 3 of over 40 open martial arts tournaments. The most notable were: Canadian Open Champion, S.O.K.A. Champion, Canada Goju Karate Champion and L.H.Z. Champion.

     Today Bak sensei's primary focus is to research and develope credible martial arts with students and friends. To date Bak's School of Martial Arts has helped over 30 people attain the rank of black belt. Renshi Bak is the first person to have introduced Kyusho Jitsu to many area martial artists, local police forces and military personnel. Maintaining a high standard and true credibility in the martial arts is optimum at Bak's Martial Arts

     Bak sensei has had the privilege to have been taught by some of the most famous martial artists in the world. These include Seneha sensei (Japan) , Onaga sensei (Japan), Meitatsu Yagi sensei (Japan), Morio Higaonna sensei (Japan / U.S.A ), Chuck Merriman sensei (U.S.A.), George Dillman sensei (U.S.A.), Bill "Superfoot" Wallace (U.S.A.), Wally Slocki sensei (Canada), Cezar Borkowski sensei (Canada), Steve Stewart sensei (Canada), Luis Morales Kyoshi (U.S.A.) and Bill Hind Hanshi the most senior Goju Ryu Karate practitioner in Canada.