Fusiongym Reviews 

From the very first class, it’s clear that Justus is an exceptional martial arts instructor. He has a remarkable ability to quickly identify your strengths and the areas where you can grow, offering guidance that feels genuinely personal. His classes are challenging, motivating, and help you develop not only your technique, strength, and fitness, but also confidence, discipline, and mental resilience. The positive energy, professionalism, and atmosphere he creates make every session something to look forward to. I highly recommend training with Justus.

Justus is a fantastic trainer. Easy-going and always in a good mood, but he knows exactly how to push you to challenge your limits. Every bootcamp session is varied and engaging, so it never feels repetitive. Highly recommended if you're looking for workouts that are both fun and challenging.

I’ve only had one class with Justus so far, but it was a great experience! He created a motivating and welcoming atmosphere from the start, explained the techniques clearly, and made the session both challenging and fun. Even after just one class, I felt encouraged and excited to come back. Highly recommended!

My son and his friends are very happy with their kickboxing lessons. Justus is great with them and they've enjoyed his teaching style. He communicates well and he's flexible. I'd highly recommend his lessons.

Recommend Justus 100%! Rarely you meet someone as passionate and genuinely committed to teaching! I’ve done an individual class with him after a few years break from martial arts and he really got the gears going! He’s knowledgeable and will give you his whole attention.

Justus is really energetic and patient during the kickboxing classes. He gives clear explanations and focuses on moving the lesson forward by switching it up. I had some basics and wanted to continue kick boxing once I moved to Utrecht. Definitely recommend!

I’ve had the chance to train with Justus a few times now, and I can wholeheartedly recommend his kickboxing workshops to anyone—regardless of experience or fitness level. He’s not only incredibly dedicated and knowledgeable, but also patient, supportive, and truly passionate about what he does.

What sets his approach apart is that it’s not just about the physical workout—though you will feel it! It’s also about mental strength, stress relief, and building confidence. Nice way to recharge!

Highly recommended!

Justus is the best, a very skilled instructor, serious but who leaves space for fun. Workouts are both technical and cardio, with also breathing exercises at the end to be in tune with your body. You will feel improvements in so many different aspects of your physical (and mental) health.
Definitely recommend to anyone.