Barbara van Erp, 56
Fat Loss
A structured plan built around your whole picture: training, nutrition and the life you're actually living. Built at the pace your body needs.
You've done the diets, the plans that work for a month. What's missing isn't willpower, it's a system built to survive your travel, your deadlines, your real week.
Restrictive diets, cutting out food groups, starting over every Monday. It works until it doesn't.
You've lost weight before. The part no one helps you with is keeping it off.
One.Journey
We look at where you are now. Training history, lifestyle, nutrition, sleep. Your plan starts here.
Together we decide what success looks like. Clear targets, specific timelines, built around your life.
Your training and nutrition plan is built around your goals, your schedule and where you start. Adjusted as you progress.
Regular check-ins and measurements keep your progress visible. Your coach uses the data to keep your plan sharp.
Between sessions, your trainer stays close. Questions answered, adjustments made, accountability kept.
Structured fat loss. Built to last.
We build a personalised training and nutrition plan around your real life. A proven system that tracks your progress and adjusts as life changes, so results hold instead of resetting every few months.
1,000+ members training weekly.
Rick Luger, 36
Private Training Basic
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
Jurriaan Puijpe, 31
Semi Private Training Premium
- Lose body fat
- Gain body mass
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
Franca Cumbo, 54
Semi Private Training Basic
- Lose body weight
- Become more toned
- Feel more energetic
Giulia Battaglia, 33
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
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
Jonathan Butler, 31
Personal Training Premium
- Improve overall health
- Muscle building
- Weight loss
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
Siobhan D'Abreu, 30
Personal Training Basic
- Improve overall health
- Mental well-being
- Muscle building
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
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
Louise Schalkwijk, 49
Semi Private Training Premium
- Lose body weight
- Become more energetic
- Move better
Mirjam Schuele, 45
Private Training Premium
Have a question? Let us help
It depends on your starting point and your goals, so at your 360° intake we set realistic milestones and track progress from there, adjusting as you go. Our approach is built for sustainable results that last, not a quick fix.
Yes. Every journey starts with a 360° intake covering training, nutrition, and lifestyle, so your plan is built around where you are now and where you want to go and adjusted as you progress.
Personal training is included in all three PT memberships — Basic (8 sessions), Premium (8 PT + 4 SPT), and Platinum (12 sessions). It's also part of the Semi-Private Premium membership (1 PT session per month) and available as a standalone PT Flex package.
We don't have a separate membership for injuries, but we regularly train clients working around specific injuries or physical limitations. Your 360° intake covers your full picture, so your trainer builds a plan that works with your body, adapting exercises as needed and progressing safely.
Most people who come to us have tried something before that didn't stick. The difference is the ONE Method: a holistic, personalized plan with a dedicated trainer and 24/7 support, built for results that last.
Founded with a purpose
After losing a family member, I understood that health cannot wait. I built ONE to be more than a gym. A place where real support meets real people. So you progress in real life.
Get started with a free consultation
Book your visit and see how training, lifestyle and context come together in one system, built around you.
- Completely free
- No pressure or commitment
- 30-minute personalized session
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