Hi! I think everyone dealing with lung issues has this problem! My pulmonary doc says that I should do 30 minutes per day, doesn’t have to be strenuous but keep moving. However, I have Bronchiectasis and MAC and produce NO sputum. I try to do this but my fatigue ( especially on med days) just makes it hard!! I do my flutter device more often on those days that I just can’t. Exercise. The main thing ( for me) is to keep those lungs clear as I can -because of mucous plugging, which promotes a ideal breeding ground for more bacteria. Long story short- doc said that my long consistent history of working out prior to getting sick probably prevented a much more progressive infection as indicated by my CT scans. Hope this helps!