Oxygen saturation and Oxygen volume are two different things. While saturation looks good the amount of Oxygen you breathe in is being shared throughout your body. When at rest your heart and other organs get what they need but once you start moving every cell in your body is clamoring for it's share of a limited Oxygen supply. My saturation at rest is typically mid to upper 90's but as I have less than 25% lung function there is less O2 available. Hope that answers the question.

Gmanexec gave you a pretty good answer. Another way to say what he said is that part of what we do is called "air-trapping", and that has to do with not exhaling enough of the stale air out to make room for O2. Purse-lip breathing is one way to counter-act this; diaphragmatic breathing also helps. Just FYI, as long as your O2 sats are up, you can keep going for as long as you can stand it, no matter how sob you are and you won't do yourself any harm. You'll just be really uncomfortable. My advice: learn to deal with it. It is something you can get used to and the more you can do the better off you'll be. When you exercise it's really important to be able to sustain our activity for 20-30 minutes to get the biggest benefit, so find an intensity (speed and incline) that you can sustain and work toward that. It will get easier.

@A MyCOPDTeam Member can you maybe get a stationary bike? I have and use all kinds of indoor equipment when the weather gets in my way.

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A MyCOPDT...

@A MyCOPDTeam Member I've been researching ozone treatments sounds promising. It puts oxygen back into to the blood.

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About exercise in bad weather, this will sound weird but if you have an indoor shopping mall you can walk through it and be fairly safe and avoid the bad weather. I know someone who walked with his wife every evening. They could stop a couple of minutes to get something to drink and the only bad weather was getting back and forth to their car.