Maybe it's not like this everywhere but at least in our area...
Play an instrument? Do grades
Dancing? Exams/competition team
Same for gymnastics etc
Football/rugby - make it into the team
There seems to be hardly any activity which can just be done for the enjoyment of it.
(Similar I guess to school subjects - not worth doing if you don't take an exam and achieve a top grade.)
Especially as children get older this seems to be such a shame - no opportunity to do an activity just for fun.
In the EU country I come from this is different.