Went swimming and realised that most of the better swimmers are locals. Is it:

(1) Foreigners think swimming as a past-time instead of a sport so more foreigners who don't really swim visit the pool than locals who think swimming is a sport?

(2) Locals really made full use of the swimming facilities and thus more locals can swim than foreigners?

(3) Locals who don't really swim have better things to do than soaking in water?

(4) There are just more locals than foreigners who go to the pool anyway?