Introducing the CrossFit 020 team

Meet the fitness experts ready to help you achieve your fitness goals.

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CrossFit 020

Our team of fitness and nutrition professionals are invested in your health. We make every decision with our members’ well-being in mind. Achieve your goals with us!

The Team


Jeroen van Duijn & Kees Houwaart


The Genesis: Erwin van Beek Erwin van Beek was a man always on the move, both as an individual and as an athlete, with an unquenchable passion for fitness. After two decades in competitive sports, he stumbled upon CrossFit in 2007 and was instantly hooked. His dedication and expertise caught the eye of Pat Sherwood from HQ CrossFit in the United States. When the opportunity arose to establish a flagship CrossFit box in the Netherlands, Erwin was the natural choice. In 2012, the doors of CrossFit 020 swung open. With a well-thought-out long-term plan, the gym focused on a group-centric yet individualized approach to fitness. From the moment you walked in, you became part of a community that prioritized quality training in a no-nonsense, ego-free environment. The Transition: Kees Houwaart & Jeroen van Duijn As Erwin’s legacy continued, the torch was passed to Kees Houwaart and Jeroen van Duijn, two individuals equally passionate about fitness but with their unique journeys. Kees Houwaart was practically born into the fitness world. Growing up in a family that owned a top-tier gym in Katwijk, he was no stranger to the clang of barbells and the heft of dumbbells. After experiencing the transformative power of CrossFit in 2012, he founded Gymbox Noordwijk in 2014, the first CrossFit-focused gym in the area. Jeroen van Duijn, on the other hand, transitioned from a career in Corporate Finance to pursue his passion for fitness. His journey took him as far as Chile, where he trained people and taught nutrition. Upon returning to the Netherlands, entering the fitness industry felt like a natural progression. The Partnership That Built a Network Kees and Jeroen’s paths crossed in 2013, and they instantly connected over their shared love for fitness and community. In 2015, they teamed up with Coach Jeroen van der Most to co-found CrossFit Leiden. This trio laid the groundwork for what has now blossomed into the Creative Sports Company network of gyms. Though Jeroen van der Most took a different route in 2020, fate brought the original team back together in 2023. Today, CrossFit Leiden stands as a testament to the power of community, passion, and entrepreneurial spirit. It is a place where fitness legacies and entrepreneurial spirits unite to create a community of champions.




With a career that began in the military and military police, Erwin has 25 years of experience in training and research, specializing in physical and combat training for police and military units. He works globally as an advisor and instructor, focusing on close combat and tactics, including firearms. His development of the F.I.R.S.T program and customized violence control programs reflects his profound knowledge. Erwin has also achieved impressive sports performances, including 17 national judo medals and participation in the Crossfit Games.

Fabian coach at CrossFit 020



Fabian studied “Sport, Management, and Entrepreneurship” at ALO Amsterdam. He began his career as a fitness trainer and instructor in 2005. Since 2012, he has served as the head trainer and personal trainer at Reebok CrossFit 020. In collaboration with Erwin van Beek, he has developed multiple training programs, coaching methods, and projects. His specialties include coaching methodology and didactics, nutrition, movement analysis, weightlifting, and sports psychology. His most recent development is the Rewire Project (2017), a 12-week program focusing on training, nutrition, and mental resilience.




Jeroen has made an impressive journey in the world of fitness and personal development. From 2016 to 2020, he was a co-owner of CrossFit Leiden, a period during which he developed his entrepreneurship and coaching skills. In 2020, he took a significant turn in his career by delving into breathing and trauma therapy, leading to the establishment of his coaching company, Fullviss. With a background in martial arts and CrossFit, combined with his extensive knowledge of breathing techniques and trauma therapy, Jeroen is known as a versatile and profound coach. His specialties include addressing stress and trauma complaints through conversations, guidance, breath therapy, and Trauma Release.

Niels coach at CrossFit 020



Niels may be the youngest of the team, but his knowledge and dedication to improving our members are exceptional. He is constantly learning new techniques, implementing fresh insights, and building up his competencies, all with the goal of offering our members the best experience possible. Niels originally came to CrossFit 020 for an internship for the Rewire Project while completing his bachelor’s in Sports Marketing. He was bitten by the CrossFit bug and decided to stay, becoming a fantastic coach and fitness beast. He is preparing to join the Marines, spending most of his time at the box, coaching, and training.




Jan Witteveen! With his passion for weightlifting and a rich background in sports, Jan is ready to elevate you to new heights. He has built an impressive reputation as a weightlifting and gymnastics coach and brings a wealth of experience. His coaching career began as a gymnastics coach, and after a detour into another career, he returned to coaching six years ago. Jan co-founded WOW, a gym that focuses exclusively on weightlifting and expanded into a CrossFit/weightlifting gym in 2021. His vision is to create a community where members feel at home and enjoy working on their physical and mental goals.




Meet coach Joanneke, a true inspiration within the CrossFit community. Her fitness journey began as a member of CrossFit 020, where she quickly developed a deep passion for Olympic weightlifting. During her time there, she not only improved her skills but also discovered her desire to share this passion for CrossFit with others. Joanneke started her coaching career at a CrossFit box in her hometown before moving to CrossFit 020 as a coach. Known for making every training session the best hour of your day, she gives classes with passion and a smile. In addition to her dedication to CrossFit, Joanneke studies criminology, enhancing her analytical and critical thinking skills. Her favorite CrossFit movement is the clean, and she believes she performs best after enjoying a quality burger. Joanneke’s combination of academic acumen and love for CrossFit makes her a unique and valued coach in our community.

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