Without doubt, handball! =)
Since I live in Sweden, it without competition one of the largest lands in the world for this sport.
Other sports are bandy and table tennis. Allthough I don't plan on being a pro in those sports, just handbal.
Met the entire Australian handball team (allthough they suck, it's still an entire lands team). But the best thing, I know 3 guys out of the Swedish handball team. And I've seen Kiel play lots of times. ^_^