Marci,
Absolutely fantastic. Your experience can give hope to lots of people. This is a clear example of when treating the asthmatic component to CF(for people who have this), that when the inflammation and swelling in the airways goes down, coupled with doing proper mucus clearance (especially with the airways now open), the FEV1 can go back up. This is why it is important to get tested for asthma. And I'm sure exercise also helped you tremendously.
Happy for you!