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AI Visibility Index · September 2026

Gyms in Brussels that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for gyms in Brussels, three times each, in French, and counted who they named. These are the businesses named in two or more of the 36 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Gyms · Brussels
100%of answers named Aspria
Answers
36
Businesses named
20
Named only once
8
Named by 2+ assistants
5 of 12
Named again on a rerun
83%

Edition September 2026. Download the data

Asked for gyms in Brussels, ChatGPT, Claude and Gemini most often named Aspria (100% of answers), JIMS (100%) and Basic-Fit (97%). Across 36 answers they named 20 different businesses, 8 of them only once. Each of four buyer questions was asked three times, in French, in September 2026.

The ranking

The AI Recommendation Rate is the fraction of the 36 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Gyms in Brussels named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1AspriaAlso written Aspria Arts-Loi, Aspria Avenue Louise, Aspria Royal La Rasante, Aspria Royal La Rasante / Arts-Loi, Aspria Arts-Loi / Aspria Royal La Rasante, Aspria Avenue Louise / Arts-LoiIs this your business?100%95%: 90 to 100%100%100%100%4 of 42.5
2JIMSAlso written JIMS Fitness, Jims Fitness, Jims Gym, JIMS Gym, Jims, Jims FitIs this your business?100%95%: 90 to 100%100%100%100%4 of 42.8
3Basic-FitIs this your business?97%95%: 86 to 100%92%100%100%4 of 41.5
4David Lloyd ClubsAlso written David Lloyd BrusselsIs this your business?36%95%: 23 to 52%25%0%83%4 of 43.3
5John Harris FitnessIs this your business?28%95%: 16 to 44%0%83%0%4 of 43.6
6CrossFit BrusselsIs this your business?25%95%: 14 to 41%0%58%17%4 of 45.6
7HealthCityIs this your business?22%95%: 12 to 38%0%0%67%4 of 44.8
8Fitness ParkAlso written Fitness Park BruxellesIs this your business?19%95%: 10 to 35%0%58%0%4 of 44.1
9Silver GymAlso written Silver Gym IxellesIs this your business?8%95%: 3 to 22%0%25%0%1 of 46.7
10Stadium KinetixIs this your business?6%95%: 2 to 18%17%0%0%1 of 43
11The GymIs this your business?6%95%: 2 to 18%0%0%17%2 of 45.5
12NeonessIs this your business?6%95%: 2 to 18%0%17%0%1 of 46.5

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 8 more names came up in a single answer and are counted above but not listed.

Is this your business?

See what the assistants say about your business today. The free checker asks ChatGPT, Claude, Gemini and Grok two of the Index questions for this category, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up.

Check your businessNamed above? Add the badgeWhat the audit does

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaudeGemini
1Aspria100%Aspria100%Aspria100%
2JIMS100%JIMS100%JIMS100%
3Basic-Fit92%Basic-Fit100%Basic-Fit100%
4David Lloyd Clubs25%John Harris Fitness83%David Lloyd Clubs83%
5Stadium Kinetix17%CrossFit Brussels58%HealthCity67%

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Gyms in Brussels, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/gyms/brussels"><img src="https://aigrow.gg/badges/index/2026-09/gyms/brussels.svg" width="312" height="100" alt="Named by AI assistants: Gyms in Brussels, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant, in French. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1Quelle est la meilleure salle de sport à Bruxelles ?What is the best gym in Brussels?
  2. 2Je voudrais m’inscrire dans une salle de sport à Bruxelles. Lesquelles me conseillerais-tu ?I want to join a gym in Brussels. Which ones would you recommend?
  3. 3Quelle salle de sport à Bruxelles est adaptée aux débutants ?Which gym in Brussels is good for beginners?
  4. 4Où trouver une salle de sport à Bruxelles avec de bons cours collectifs ?Where can I find a gym in Brussels with good group classes?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
36 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Where the assistants look

The sites read most often, with web search on, before the assistants answer about this category in Belgium. From the AI Source Map: 5 answers.

See every site for this category
jims.be
Read in 80% of the answers
reddit.com
Read in 80% of the answers
wikipedia.org
Read in 80% of the answers

Elsewhere in the Index

Gyms elsewhere
AntwerpGhentLiègeBordeauxGenevaLausanne
Also in Brussels
DentistsLawyersAccountantsPlumbersReal estate agenciesRestaurants

Is your business on this list?

The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.

Run the free AI scanRead the method

Edition September 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0