VALTARISPersonal Training in The Hague & Rotterdam
More than personal training. An exceptional service experience built around your needs. From exceptionally fast communication and proactive attention to coaching where every detail is carefully considered.
Book a free introductory call15+ years of experience
In strength training and fitness.
Fitness Trainer A and B Diploma
Certified personal trainer.
1-to-1, Duo & Online
Flexible formats, tailored to your situation.
Exceptional Service
A level of service that goes beyond standard coaching.
About me
My name is John Jacobus.
I am a certified personal trainer with the Fitness Trainer A and B diplomas and more than 15 years of experience in strength training and fitness.
Sport has played an important role in my life for many years. It has taught me how important discipline, perseverance and consistency are. I bring that experience with me into my work as a personal trainer.
In my coaching I combine a results-driven approach with personal attention. Whether you want to lose weight, build muscle or improve your fitness, we work with a clear plan that matches your level and goals. I attach great importance to good technique and personal progress, but I consider it at least as important that you feel at ease and can train with confidence.
Outside the gym, I keep developing myself. By reading regularly and taking additional courses and training, I continue to broaden my knowledge and further develop my skills as a trainer.
THE VALTARIS APPROACH
Why Valtaris?
Throughout my years in the fitness industry, I have seen many different approaches to training and coaching. One thing I noticed was that the focus often lies primarily on the training itself, while the personal service surrounding it is just as important.
That belief led me to create Valtaris. My ambition is to elevate personal training, not only through high-quality coaching, but above all by delivering an exceptional service experience.
This means fast, personal communication, proactive involvement, and attention to the smallest details. I want clients to feel well supported not only during their training sessions, but also beyond them, knowing that their progress, preferences, and individual circumstances genuinely matter.
At Valtaris, it's not just about the results, but the entire experience of achieving them.
Personal Attention
Proactive follow-up and dedicated coaching.
Flexible Scheduling
Coaching fully tailored to your schedule.
4 Hours
Response Guarantee
Personal response within 4 business hours.
Weekdays Mon–Fri, 09:00–18:00
Choose your coaching
An approach that fits your goals and level.
Personal Training
Fully 1-on-1 guidance, in the gym with me.
View Personal TrainingDuo Training
Train together, with personal guidance for both.
View Duo TrainingOnline Coaching
Professional guidance, wherever you train.
View Online CoachingPremium Coaching
Valtaris' highest level of service. An exclusive all-in-one programme with intensive coaching and priority support.
View Premium CoachingTraining Locations
Client testimonials
What my clients say
“Looking back, I haven't just gotten stronger physically. I've learned how to move correctly, gained confidence in the gym, and found myself genuinely enjoying the process. Every session feels like another step forward, and it's been amazing to see how much I've grown since we started.”
“I've learned how to move correctly, gained confidence in the gym, and found myself genuinely enjoying the process.”
Jen
Personal Training
“Dankzij de begeleiding van John kwam dat vertrouwen verrassend snel terug. Zijn manier van coachen is persoonlijk, direct, motiverend en met veel humor. Daardoor ga je nét een stapje verder dan je zelf denkt te kunnen. Binnen vier maanden had ik al enorme vooruitgang geboekt in kracht, spieropbouw en conditie.”
“Zijn manier van coachen is persoonlijk, direct, motiverend en met veel humor. Daardoor ga je nét een stapje verder dan je zelf denkt te kunnen.”
Ariane
Personal Training