everyone else is gone anyway. claire.. the doc IS insensative to your cycling aspect if not to you. Some of us are not as "equipt" for endurance as others for sure.You go on 200+ rides, that's way more than average, even for the forum, assuming folkes do ride as indicated ,which is questionable of course.I know much about asthma,more than I'm apt to say here,much good imfo. has been shared here by fellow members anyway. As far as not increasing EFFECTIVE lunge capacity..WRONG.. swimming will help you.Cycling is great over-all,you ride a very impressive distance,slow or fast,doesn't matter.You have developed techniques if you will,which enable you to Cycle well,despite your shortcomings,you've compensated in other ways,automatically. Swimming will "force " you to breath in a manner unfamiliar to you.The Y is OK I guess ,I hate it.I use pools at communities
or wherever I could in the past,invited or "semi-invited".Do it twice a week is enough to start.You'll find it may play havvock with your muscles but this too shall pass.I live in a developement with a pool for that reason.