@barbb Well, my doctor friend is the one who told me to exercise because it would keep my lungs in shape and there is no doubt that probably anyone would recommend it (of course only if you're able). And I think she's absolutely right. At my last CT scan which was the first one in two years I had no progression so I can't ask for much more than that. My guess is that exercise is a big part of it. I also nebulize 7% saline and have been on no antibiotics for three years. I exercise six days a week, take one day off and try to at least 30 minutes of cardio a day, whether it's a BRISK power walk or slow jog or a mix of both. Hope that answers your question. Nan

Barb - I have MAC, asthma and Bronchiectasis, and regular walking for the past 2 years has increased my lung capacity, my ability to walk, and my general health. When I started, I could walk about one block at a time. Now I can walk for at least an hour, and even jog a block or two as well as play with my grandsons, even climbing through snow. So yes, walking helps!
I still get out of breath, but regular use of my inhalers and saline news keeps me going. Your results may vary, and I invite others to chime in too. And I get some puny days too, but I adjust my level of activity as needed.
Sue