Hah, some VERY wierd translations on that map I don't mind telling you. Exhale however is pretty accurate, although a more litteral translation would be "Blow out", but I guess that's not much better.
[EDIT] To be fair a lot of the metro names in Sthlm are pretty damn wierd in the first place. I believe the Exhale name is due to the fact that they only stop long enough there for you to get out if you exhale, pull your tummy in and squeeze sideways through the doors really really quickly. I could be wrong though, maybe my drivers have just been a little over anxious to get out of the rough neighbourhood...