I was thinking about that when I was dropping my 6 year old off at some hobbies earlier - it’s pretty much expected to have learned how to ride a bicycle before starting school, and it massively expands the area you can go to by yourself. When she went to school by bicycle she can easily make a detour via a shop to spend some pocket money before coming home, while by foot that’d be rather time consuming.
Quite a lot of friends from outside of Europe either can’t ride a bicycle, or were learning it as adult after moving here, though.
edit: the high number of replies mentioning “swimming” made me realize that I had that filed as a basic skill pretty much everybody has - probably due to swimming lessons being a mandatory part of school education here.
Yeah, but even if the chance per outing decreases a large increase in outings can still bring the average up. I was an avid skier growing up aND hit the slopes every year, the only surgery I’ve had was from a skiing accident in my early 20s when I was forced to wipe out or collide with another skier and snapped my ACL.