Testimonials for Jiu-Jitsu Coach Jack Cox and NBJJA


“Jack and the crew fuelled my new passion for jiu-jitsu, it is where I earned my first stripe. If you are thinking of trying it out, there is no better gym or man. Thank you.”

-Adam P.


“Very welcoming, very open gym whose students are learning at an incredible pace. Jack is acutely focused on the latest techniques and trends in BJJ and more importantly the best teaching methods. NBJJA is relatively new gym but already has a strong community, and dedicated regular students. Excellent place to send developing tweens and teens as Jack instills discipline in his process and naturally commands respect. Safe for women and mature students as the Pedro Sauer curriculum greatly emphasises technique and timing over strength, athleticism or flexibility. Students are also provided video tutorials to supplement classes. As for cleanliness, Jack was formerly commercial cleaner and you won’t find cleaner mats, bathrooms, and showers anywhere.”

- Marc G


“Jack is such a great teacher. You can tell how passionate he is about teaching jiu-jitsu and possesses a depth of knowledge. As daunting as it was as a new white belt, I look forward to his classes. He explains all the moves so clearly, always encouraging and always has time to answer my questions. I wouldn’t hesitate to recommend training with Jack to anyone who is wanting to start Jiu-Jitsu.”

-Brendan K.


“Training BJJ is like learning a new language! I leave with the moves running through my head, I even dream about them! Haha. I never would have tried it though if it wasn’t for Jack. The environment at NBJJA is awesome. Jack has created such a lovely family vibe in there. Everyone is so friendly and welcoming.”

-Nat M.


“Such a great vibe and an awesome group of people. This is definitely not your average BJJ gym.
As a beginner I felt super comfortable from Day 1. Jack is a great teacher and very welcoming and all the members are super friendly and always willing to help you improve your technique.”

-Steve P


“I could not recommend a better Jiu-Jitsu Academy than NBJJA. Jack, the founder of the Academy, is passionate and an extreme devotee to the sport which shines through in his teaching. Initially I was concerned that a martial arts class would encourage their "wrestling, ninja kicks, body slamming" behaviours at home. However I have been amazed at the discipline they adopt as soon as they step onto the mat which is now being adopted during daily life. It is a very active class and the kids are left puffed out and sweating which is great. Good luck at getting them out of their uniforms....my boys want to wear them all week!”

-Astrid G.


“An all round fantastic experience for anyone looking to improve their jiu-jitsu game. Family and female friendly academy with a relaxed and inviting vibe. Can’t wait to come back and train with Jack.”

-Louise S.


“Northern Beaches Jujitsu Academy is fantastic. Our family came from another gym and this Academy blows them out of the water. Great for all ages and highly recommend. professional and personable and very organised kids classes.”

-Lynda L


“Fresh faced and no idea how good Jiu-Jitsu would be for me, I was welcomed with open arms by Jack and the team at NBJJA. Starting something as a novice can be super intimidating but this was not the case with the on boarding process at NBJJA. I was looked after and felt very comfortable learning something from scratch. I would highly recommend Jack and the team at NBJJA if you're looking for a change in direction for your fitness and mental well being. I have learnt so much over my time at the academy and cant thank the NBBJA crew enough for how much its positively impacted my life.”

- Jacob G


“Jack offers kids such a fantastic combination of fitness, strength, and technique for the nippers sessions. He knows all the kids names and is a great trainer, with the imaginative challenges and games he offers. My almost 4yr old son loves Jack’s classes and wakes up every day asking if it’s ju Jitsu day. It’s one of the best things to watch as a parent as it is so funny to watch, while also making you proud of your kid for taking on challenges. I highly recommend these classes with Jack if you are wanting to give your kid a great bunch of challenges that ultimately lead to more confidence and better physical abilities.”

-Bruce L