VALTARISPersonal Training in The Hague & Rotterdam
No standard programme, but personal training that is continuously adapted to your goals and progress.
15+
Years of experience with strength training and fitness
Broad experience
With a wide range of training goals and levels
1-on-1, Partner & Online
Certified
Results-driven
Personal approach
Premium experience
About John
ABOUT ME
Founder & Personal Trainer at Valtaris
My name is John Jacobus. I am a certified personal trainer with Dutch Fitnesstrainer A and B qualifications and 15+ years of experience with strength training and fitness.
Active reading is an important part of my own development. I read widely in psychology, philosophy and literature. It broadens my view of discipline, behaviour and personal growth, and it shapes the way I coach people.
At Valtaris I combine that knowledge with practical coaching: focused training, making conscious choices and understanding why a particular approach works.
WHY I BECAME A TRAINER
Training has been a fixed part of my life since I was fifteen. Over the years I have experienced how much difference good technique, structure and consistency can make.
When I started coaching people myself, I noticed how often people train hard without a clear direction. Exercises are done because they are popular, programs are changed randomly and progress is barely tracked.
My role as a trainer is to remove that noise. We determine what matters to you, choose the right approach and set up the training so that every session has a clear purpose.
MY APPROACH
I deliberately take on a limited number of clients, so that every client gets the time, attention and guidance needed to make real progress.
Whether it is about losing weight, building muscle or improving your fitness: every journey starts with an extensive intake in which I discuss your goals, experience and lifestyle. Based on that, I create a personal plan that is fully tailored to your situation.
During the journey I track your performance and technique. Based on that, I adjust the training, increase the challenge when possible and correct course when something is not working.
Certified Personal Trainer
Recognised and qualified to coach you safely.
Dutch Fitnesstrainer A and B qualifications
Solid theoretical and practical foundation.
Personal coaching
A tailored plan for your body and your goals.
Beginners and advanced
Whether you're just starting or have trained for years — welcome.
THE VALTARIS APPROACH
Why Valtaris?
Personal guidance, continuous adjustments and a plan tailored to your goals, level and lifestyle.
Personal guidance
You don't train from a standard program. We build a plan that fits your goals, level and lifestyle, and we continuously adjust it based on your progress, recovery and performance.
Result-driven approach
Every exercise has a purpose. We measure your progress, adjust where needed and make sure every session moves you closer to your goal.
Continuous optimisation
Your training and nutrition plan are continuously adjusted based on your progress so you keep growing.
Direct contact
Question about training or nutrition? Count on fast support and clear feedback.
Quality over quantity
I deliberately take on a limited number of clients so each one gets the time, attention and guidance they need.
Experience you can trust
15+ years of experience with strength training, muscle building, fat loss and conditioning, combined with Dutch Fitnesstrainer A and B qualifications.
Locations
Training Locations
Train with Valtaris in The Hague or Rotterdam. View practical information about location, accessibility and guidance.
Personal Training in The Hague
Train with Valtaris in The Hague. View practical information about location, accessibility and guidance.
Personal Training in Rotterdam
Train at GymOne Rotterdam or MyLife Aan de Maas. I personally coordinate availability and location with you.
Ready for the first step?
Book your appointment. We discuss your goals and build a plan together.
Book your appointment