Fat loss
A structured training and nutrition system that creates real, sustainable fat loss. Without crash diets or unsustainable routines.
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Everyone sees a part of you. We see the whole picture. We start with who you are and what your goals are.
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Our memberships are designed to meet your challenges.
Who we are
Find out everything about us.

We connect your training to what actually matters to you and build a complete system to get you there.
Whatever brought you here; weight, energy, performance or recovery. We build a program around it. Choose your goal and see how ONE approaches it.
A structured training and nutrition system that creates real, sustainable fat loss. Without crash diets or unsustainable routines.
Progressive, evidence-based strength training. We track your load, progression and recovery so every session builds on the last.
Feeling drained despite doing everything right? We look at training, sleep and stress together and build habits that restore your energy.
Movement is one of the most effective tools for managing stress. We build a programme that supports your nervous system.
We build a programme around peri-menopause changes; focused on maintaining strength, energy and consistency through every stage.
Structured rehabilitation through strength. We work alongside your recovery timeline to rebuild movement, confidence and capacity.

We bring your training and lifestyle together into one integrated system.

24/7 support & accountability through our app

Sessions built around your life. Guided by specalists who know your whole picture.
No quick fixes. Progress built on structure that holds when life gets busy.

Train in a private, non-intimidating space alongside people who hold the bar high.
Most fitness offerings focus on one thing. At ONE we focus the whole picture in one place.
Training is just one part of the picture. We account for your work demands, sleep quality, stress levels and daily habits. Because lasting results require the whole system working together. Our methodology is built on evidence, refined through 1,400+ members.

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.

"After years of therapists and psychiatrists, working with Serva was the first thing that actually helped me move forward — by finally feeling safe enough to be vulnerable."
Private client
Giulia Battaglia, 33

Rick Luger, 36
Private Training Basic

Siobhan D'Abreu, 30
Personal Training Basic

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
Jurriaan Puijpe, 31
Semi Private Training Premium

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
Barbara van Erp, 56

Louise Schalkwijk, 49
Semi Private Training Premium

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

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

"After my stage 3 cancer diagnosis, four months of coaching with Serva helped me make peace with my body, reconcile with a sister I hadn't spoken to in ten years, and face treatment as an adventure instead of something happening to me."
Beverly
Franca Cumbo, 54
Semi Private Training Basic

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

Olga Pakholiuk, 33
Personal Training Basic

Mirjam Schuele, 45
Private Training Premium

Book your visit and see how training, lifestyle and context come together in one system, built around you.
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