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The Gym
Fully equipped, generously proportioned, bathed in natural light through the full-height glass windows.
A club on a human scale
Gym & social wellness club at Montgomery, Brussels
Your third place, after home and work.
Our philosophy
The bonsai teaches us that greatness can reside within the smallest of things.
Philosophically, the bonsai embodies the harmonious relationship between humanity and nature. It is not a matter of dominating the tree, but of co-creating with it, the human guides, nature decides.
It is an art of discipline and observation, one that demands consistency, precision, and humility. Nothing is immediate, the effects of every decision may reveal themselves only years later.
It is in this spirit that Bonsai was born. We see our members as seeds, and our club as the pot in which they grow. And as with any bonsai, proportion is everything. Our membership is kept in measure with our space, so that each member has room to grow.
The club · 500 m²
Four spaces, one rhythm.
Light, materials, colours, scents and sound, thoughtfully composed to accompany your effort and turn each session into a moment of reconnection.
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The Studio
Yoga, Pilates, HIIT and more, held in a dedicated spacious room, with large smoked-glass mirrors, under diffused daylight.
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The Lounge
Sit down, catch your breath, stay a while. The third place we come back to.
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The Wellness Suite
Finnish sauna, cold plunge, sun shower. A full recovery ritual, all in one considered arc.
Membership
One rhythm. Five ways to begin.
From a single day to a full year. All memberships include full access to the club, including the gym, the group classes and the wellness suite.
Founding Member · Phase II
12 Months
Available now
Phase I closed on 30 September 2026. Full.
€212/ month*
€242/month on the Signature Plan
Offer open until 31 October 2026. 50 places remaining.
- Unlimited access to gym, group classes & wellness
- 7 days advance class booking
The Signature Plan
12 Months
From 1 November 2026
€242/ month*
A full cycle, the club at its best value.
- Unlimited access to gym, group classes & wellness
- 7 days advance class booking
6 Months
€262/ month*
Half a year to let a rhythm take root.
- Unlimited access to gym, group classes & wellness
- 7 days advance class booking
1 Month
€282/ month*
For the first steps, no long commitment.
- Unlimited access to gym, group classes & wellness
- 7 days advance class booking
Elite · 12 Months
€282/ month*
For members who plan their week ahead of everyone else.
- Unlimited access to gym, group classes & wellness
- 10 days advance class booking
- 1 guest pass per month
Book a visit to explore the club firsthand and discover everything it has to offer.
Day Pass
Founding-period rate
A full day of the gym, the group classes, the wellness suite and the lounge.
Available online, or at reception after your visit.
Get a Day PassWhat's included
One membership. The full club.
- Fully equipped gymPremium strength and cardio equipment, generous spacing, natural light.
- Group classesYoga, Pilates, HIIT and more. 7 days advance booking (10 days advance booking for Elite members).
- Wellness suiteFinnish sauna, cold plunge and sun shower, a complete recovery arc.
- Personalised CoachingCoaching is a core part of the Bonsai experience. You can work one-on-one with an experienced coach who tailors everything to you, or train alongside a partner in a duo session.
- Running ClubOrganised runs through the Parc de Woluwe, guided by our coaches.
- LoungeTime to pause, meet other members, or simply stay a little longer.
- Changing roomsSeparate for men and women, with showers, hairdryers and the essentials. Nothing to bring but yourself.
- Fresh filtered waterFresh filtered Aqualex water is available throughout the club.
A third place
Bonsai is not merely a fitness club. It is a living space, where we cultivate consistency over haste, balance over excess, and lasting progress at your own pace.
