Most of you will be skeptical so this won't be long. I have Emphysema. My last FEV1 was 29%. In my day-to-day routine I am not even aware of my COPD. I am aware of it if I tax myself with inclines or stairs. On l level ground I can walk as long or as far as I want. Not fast but not noticeably slow either. I use something that is 100% Russian. I use it for 20 minutes at night. It's not easy nor is it fun but it seems to work. It seems to have worked in my case to my satisfaction. I have no interest in this product, financial or anything else. For that reason I'm just going to give you 3 words to put into Google and you can take it from there. To learn where to get this, in addition to Google put them in Ebay and Amazon. The words are: Frolov Breathing Device
PS: I'm not Russian. I'm U.S.