I like to enhance hotels with their available facilities (hotel bar, wlan, breakfast, swimming pool, bicycle storage, …).
Many hotels also have their own gym / fitness centre and now I’m wondering whether there is already an established tag to represent this?
I came across several tags via taginfo, none of which seem to be documented.
For example gym=yes (32x), fitness=yes (47x), fitness_centre=yes (101x), …
Is there already a consensus? If so, I would be happy to document it 
I came across several tags via taginfo, none of which seem to be documented.
For examplegym=yes(32x),fitness=yes(47x),fitness_centre=yes(101x), …
Is there already a consensus? If so, I would be happy to document it
looking at the numbers there doesn’t appear to be a consensus (or even interest). Just go with any, or document one and it will become the standard.
English is not my first language, but are gym and fitness centre the same or they could differ? Like: a gym maybe has only sport related machinery, while a fitness centre maybe has also a sauna or a hot-tub to relax?
Would it make sense to map these facilities as separate elements within the hotel area instead? E.g. instead of tagging the hotel with swimming_pool=yes, map a separate leisure=swimming_pool with appropriate operator & access tags? (Likewise with the gym example.)