Semi-Private Training Sessions
Train in a small group with expert coaching, personalised to you.
Semi-Private Training
Personal coaching in a focused environment. Train with expert guidance, a clear structure and a community of people committed to progress. A small group setting designed around consistency, performance and connection.
Between work, family, and everything else life demands, finding the time and consistency to prioritise yourself can feel impossible.
Real progress begins with understanding what works for you. Through personal coaching, structured training and lifestyle guidance, you build the habits and capabilities required for long-term performance. Every session has a purpose. Every adjustment moves you forward.
What's included
Everything you need to build consistency.
360° Intake
A complete assessment of your training, nutrition, lifestyle and current situation. Together in one integrated system.
12-Week Plan of Action
A clear roadmap to guide your development. Every step of the way.
Training App Access
Your workouts, progress and guidance in one place. To measure the whole picture.
Progress Tracking
Understand your development and adjust with purpose.
24/7 Support & Accountability
Continuous guidance between sessions to help you stay consistent.
Why ONE semi-private training?
Consistency grows when structure, coaching and community come together. At ONE, Semi-Private Training gives you personal guidance in a safe, focused space, alongside a tribe that shares your ambition.
Expert Coaching
Professional guidance from your ONE coach, every session.
Small Group Connection
Train alongside people who value progress and commitment.
Structured Development
Follow a clear approach designed around your goals and life.
Sustainable Consistency
Create a routine that fits naturally into your life.
1,000+ members training weekly.
In just six months, I’ve lost weight, built strength, and achieved more than I thought possible. This gym’s professional approach, personalized programs, and supportive environment make it a great choice for anyone serious about their fitness goals.
Giulia Battaglia, 33
Jurriaan Puijpe, 31
Semi Private Training Premium
- Lose body fat
- Gain body mass
Giulia Battaglia, 33
I’ve been blown away by my experience at One. It’s a gym that feels personal, like an actual community. When I started doing private sessions with my trainer, I immediately felt how closely my progress was being monitored to make sure I had the tools to succeed. You’re not just clocking into a class and clocking out. There are real people here who genuinely CARE about your success.
Melyssa Griffin, 37
Barbara Van Erp, 56
Personal Training Basic
- Improve health metrics
- Lose body fat
Love this gym! The vibe, the concept and the energy - all spot on. It is the most inspiring and supportive workout community I have been part of.
Eerika Roos-Kulvik, 35
Siobhan D'Abreu, 30
Personal Training Basic
- Improve overall health
- Mental well-being
- Muscle building
Rick Luger, 36
Private Training Basic
Barbara van Erp, 56
Training at One has genuinely changed my life. I don’t just feel physically better than I ever have — I’m emotionally stronger too. The trainers here are incredibly dedicated; they truly understand life’s challenges and know exactly how to adapt your program to get the most out of you, even on days when you’re exhausted or emotionally drained. The environment is wonderful. Everyone is friendly, and you can tell people genuinely want to be there. It’s an incredible place, and I’m so grateful I found it. Highly recommend to anyone looking for more than just a gym.
Natalie Wills, 44
Jonathan Butler, 31
Personal Training Premium
- Improve overall health
- Muscle building
- Weight loss
This place is more than just a gym; it’s truly a life-changing space. I’ve been training here for two months now, and I never imagined I would get this committed to my fitness journey.
Erdal Aydin
Louise Schalkwijk, 49
Semi Private Training Premium
- Lose body weight
- Become more energetic
- Move better
Joined ONE at the end of March and it’s honestly been one of the healthiest changes I’ve made this year. What I appreciate the most is how sustainable the approach feels — not just “go hard at the gym”, but actually building habits that fit my real life structure. A definite additional call out is for ONE environment which is welcoming, motivating and grounded. Very happy I started this journey here.
Gabriel Martins, 41
Franca Cumbo, 54
Semi Private Training Basic
- Lose body weight
- Become more toned
- Feel more energetic
Came back to training after a long break (and I’ve been working out for years) and honestly ONE has been the best training I’ve ever had. In just 3 months I’ve had amazing results, proper body recomposition and I feel stronger/leaner already. The sessions really push you, but in a good way and it actually works.
Panos Ellinas
Olga Pakholiuk, 33
Personal Training Basic
- Improve posture
- Build muscle
Mirjam Schuele, 45
Private Training Premium
A smarter way to train
Most fitness offerings focus on one thing. ONE brings everything together.
Meet the team
At ONE, your progress is a team effort. Every week, the full team reviews which clients are on track and who needs more support. Behind every trainer is a mentor. Behind every mentor is Glenn. You don't just get a coach. You get a team with a proven method, built to get you where you want to go.
All in. One. One place. The whole picture.
Semi Private Training Basic
€329,-/ mo
- 8 SPT sessions
- 360 degree intake: Training, Nutrition, Lifestyle assessment
- 12-week plan of action
- 24/7 Support & accountability
- Train App Access
Most popular
Semi Private Training Premium
3 extra training sessions for just €70 extra
€399,-/ mo
- 8 + 2 SPT sessions (Worth €80,-)
- 1 Personal Training session (Worth €95,-)
- 360 degree intake: Training, Nutrition, Lifestyle assessment
- 12-week plan of action
- 24/7 Support & accountability
- Train App Access
Have a question? Let us help
We accept IDEAL and credit card. You need a Dutch bank account.
You can pause your membership for up to 4 weeks per calendar year (2+2 or 4 consecutive weeks), with 4 weeks' notice via the Trainin app. Separately, each credit equals one session; credits stay valid for 2 periods (8 weeks) and expire after that. Pausing doesn't apply to one-off Flex packages.
Your first payment is due before your intake session, then every 4 weeks after that (not on a fixed monthly date).
There's no separate pricing for injuries or physical limitations. The memberships are the same for everyone. What changes is the plan itself.
Memberships are billed every 4 weeks. For more flexibility, our Flex packages are paid as a one-off and run for 4–8 months.
