GRIT IS A POSITIVE TRAIT BASED ON AN INDIVIDUAL’S PASSION FOR A PARTICULAR LONG-TERM GOAL OR ENDSTATE, COUPLED WITH A POWERFUL MOTIVATION TO ACHIEVE THE DESIRED OBJECTIVE.

Welcome to GRIT
The Gym in Leuven where Sports Performance and Rehabilitation experts guide you towards optimal athletic performance, health and fitness, injury prevention, and physical recovery.
At GRIT, we guide both recreational and professional athletes. Whether you join a group session or choose individual fitness coaching, at GRIT we help you achieve your physical goals. From beginner to experienced athlete, our specialized approach helps you to get stronger, fitter, and injury-free. Our personal guidance during sport-specific or monthly coaching focuses on all aspects of a fit and healthy body that's ready to perform optimally.
In our GRIT GYM and GRIT Belgian Sports Clinic, we combine training & coaching, sports medicine, and sports physiotherapy under one roof. Our services are suitable for beginners, recreational, and advanced athletes alike.
Our Guidance in Sports and Performance
We believe everyone can push their physical limits with the right guidance. We offer a multidisciplinary approach with specialists in:
Personal Training & Guidance – Work on your fitness with private training, individual fitness coaching and/or group sessions led by an experienced Personal Trainer in our private gym in Leuven.
Sports Performance Training & Coaching – Want to become faster, stronger, and improve your agility? Our Sports Performance training improves your athletic ability and performance with a scientifically-based customized program.
Sports Medicine & Sports Injuries – Examination, Diagnosis, and Treatment of all sports-related injuries.
Sports Physiotherapy & Injury Prevention – Through Examination, Screening, Treatment, and continued medical guidance for sports injuries, our experts ensure better and smarter recovery all the way through your return to sport.

Why choose GRIT?
✔ Individualized and science-based guidance
✔ Specialized team in a top facility in Leuven
✔ Easily accessible location with everything under one roof:
from sports performance, sports nutrition and mindset to sports injury rehab
✔ Coaching at every level:
for beginners, advanced athletes, and elite athletes
✔ Wide range of training options:
from strength training and group classes to endurance coaching and top-level running programs
Want to get more out of your training?
Ready to bring out the best in yourself and achieve your objective?
Come visit us and take the next step in your athletic journey!
- GRIT GYM Sports Performance Center – Asstraat 2, 3000 Leuven
- GRIT Belgian Sports Clinic – Engels Plein 35/103, 3000 Leuven
Make an appointment or sign up now for a free trial group session or intake consultation!
Frequently Asked Questions
Which GRIT pillar should I contact with my inquiry?
Do you want personal guidance for strength training or running programs? Then you can turn to Personal Training & Sports Performance. Through this link to our online ClubPlanner, you can create a profile, find our webshop for subscriptions, and view the schedule for group sessions. If you have any doubts, you can always contact us via the request form or email: info@gritsportsperformance.be
For injuries or medical guidance, you can visit our GRIT Sports Clinic. Our doctors will provide you with the necessary advice and create a personalized Sports Medicine approach, which may include sports physiotherapy. Do you already have a prescription? Then you can make an appointment for Physical Therapy directly. If you have any doubts, you can always contact us via email: secretariaat@gritsportsclinic.be
Can GRIT guide me when working towards a specific goal or sports event?
In addition to our group sessions and Personal Training sessions at our GRIT GYM, we also offer online monthly coaching. With the BASIC or PRO PROGRAM, your coach provides you with the necessary training plans remotely. You can count on weekly/daily communication for your questions, adjustments, and feedback. For more information, you can request a free intake consultation via the "MAKE AN APPOINTMENT" tab, after which we'll contact you as soon as possible!
What should I do if I get injured during my training?
It is important to stop the activity that caused the injury and rest or train alternatively without pain. Consult a sports physician or doctor as soon as possible for professional advice on treating the injury and preventing further damage. Depending on the severity of the injury, you will be referred to a sports physiotherapist for rehabilitation. They will guide you through returning to sports and monitor the necessary training load.
Can I participate in group sessions while recovering from an injury?
Our doctors, physiotherapists, and coaches maintain close communication with each other to provide the necessary guidance and make adjustments to your training when needed. It's always advisable to consult with your coach before participating in group sessions when you're recovering from an injury.
How can I become stronger after an injury?
An injury can be a challenging test, but also an opportunity to come back stronger. By focusing on your rehabilitation, adapting your training, and remaining patient throughout the process, you can become stronger and more resilient than ever before. The work doesn't end after recovery. It's important to continue investing in injury prevention and strength training even after returning to sports. Try one of our group sessions or request a free consultation with one of our coaches. They'll help you put all the pieces together and create a personalized training plan that perfectly meets your needs.
How can I prevent an injury?
While completely preventing injuries is impossible, you can significantly reduce their likelihood. A sensible build-up of your training is crucial, with increases in intensity or volume not exceeding 10% per week. It's important to listen to your body and take persistent signs of overuse seriously.
By alternating between impact and non-impact training, you give your body the chance to recover while staying active. Invest in developing sufficient basic strength and work on your postural and dynamic control, which is essential for optimal movement patterns.
Also consider your specific body type, as this determines what load is optimal for you. Finally, sufficient quality sleep plays an indispensable role in the recovery process. With this balanced approach, you can safely achieve your sporting goals while minimizing injury risk. Allow yourself to be optimally guided by the GRIT professionals who help you achieve your goals step by step in a safe and effective manner.
Want to read and learn more about this? You’ll find all the answers in this ultimate guide: 'Sportblessures' by Johan Bellemans (Borgerhoff & Lamberigts)
Where can I find the prices and purchase session passes?
We always recommend scheduling a free intake consultation before starting with personal training or guidance. You can access our webshop by creating a profile on our ClubPlanner via the login button in the top right corner of the menu bar.
For group sessions, you can try a first session for free by adding the FREE TRIAL from our webshop to your shopping cart and completing the purchase. Don't forget to reserve your spot through the schedule, which you can also find in your personal online account.
For more information about Sports Medicine and Physical Therapy, please contact: secretariaat@gritsportsclinic.be
Our Mission
Achieve your objective
Athletes live and die for results, records and recognition. Athletes have a particular long-term goal or end state, coupled with a powerful motivation to achieve the desired objectives. Until the day they sustain an injury, when these goals become suddenly jeopardized.
Being injured means a time of insecurity. A time of watching others achieving records and results. It is the loneliest part of a career. And the hardest part.
But for every athlete, this period can become a decisive moment in his or her career. Since Nietzsche we know, what doesn’t kill you, might make you stronger.
Pele won his first world cup right after being seriously injured. Greg LeMond won 2 consecutive Tours de France just after recovering for more than 2 years. Monica Seles, Petr Cech, Rafael Nadal, Sugar Ray Leonard; many of sport’s most famous names have shown that being injured can make the greatest athletes even stronger than before.
They were able to come back because they believed in it. Because they worked hard to recover and to return stronger and better than before. Because they had a team around them, a team that cared for them physically and mentally.
GRIT, Belgian Sports Clinic was founded in 2014 by Johan Bellemans, Lieve Deckers and Maarten Thysen, joined by Rudi Diels in 2017, and supports athletes through their entire career, especially when they need it most. With the right guidance of our specialized team, we make it our mission to guide all athletes towards their desired objectives taken into account their individual passion for a long-term goal. The GRIT team helps and supports the athlete in all phases of his or her sports development and participation, at the professional, amateur or recreational level.