Hi Maggie - you bring up a good point. Since exercising and staying active is such an important part of managing one's COPD, your concern is understandable.
Fortunately, we do have an answer for you. There are exercises one can do while remaining seated. I thought you might gain some additional insight from this article: https://copd.net/living/hip-heel-stretch.
This may provide you with the very outlet you are looking for. What do you think?
Leon (site moderator COPD.net)