There are many yoga centers that teach Qigong as well. There are videos that you can buy if you are unable to go to a class.
I remember about fifteen years ago in the magazine Roundtable, there was a man selling a video (a man with CF) who had gone to China to study Qigong. The video quality was poor but I do remember the moves. It is worth trying. He mentioned something extraodinary about Qigong and how it helped improve his CF. I wish I followed up with his advice. That is what I am going to do very soon is enroll in a class.