Fitness centre

The tagging situation with fitness centres is a mess. There is a proposal for amenity=fitness_center, but in the talk page people have suggested using leisure=* or even sport=*. In addition, the proposal uses US spelling (center), while OSM tries to consistently use British spelling for tag names (centre).

There is also amenity=gym, which has been explicitly deprecated and documented as "do not use", because it's inherently ambiguous. And yet it's used more often than the rest.

However, every tag that has been suggested seems to be in actual use in the map, plus some combinations of them.

Taginfo

To illustrate how much of an inconsistent mess we have, here are the taginfo statistics for the different tags:

amenity=fitness_center	amenity=fitness_centre	amenity=fitness	amenity=gym	amenity=sports_centre
leisure=fitness_center	leisure=fitness_centre	leisure=fitness	leisure=gym	leisure=sports_centre
sport=fitness_center	sport=fitness_centre	sport=fitness	sport=gym	sport=sports_centre