There are definitely some linguistic or cultural differences. In German, for example, Sport is broader and encompasses all forms of exercise. It would be completely normal to have the following conversation: “Machst du Sport?” “Ja, ich gehe jeden Tag laufen” (“Do you do any sports?” “Yes I go for a run every day”) Same with going to the gym.
Whereas in English these would probably only be considered sports if you’re doing them competitively, in a race or a weight lifting competition.
OSM and the Wiki are being edited by people from all over the world, and this is how we get tags like sport=yoga and sport=fitness.
There’s even a documented (!) tag sport=hiking, defined as “the sport of going for long, vigorous walks”.