, this is a great question, I know many in our community deal with similar issues when walking around and needing to sit down to get their oxygen level back up, I'm sure they will chime in if they have any advice to share. The zephyr valves are also something many in our community have shared about you can read more here: https://copd.net/search?s=zephyr%20valves. I would definitely recommend speaking to your doctor about if these would be a good option for you and if you would be a candidate for the procedure. All the best, Sam S. (COPD.net, team member).