I will add my dr suggested I get something called an acapella. It’s the opposite of a spirometer. Instead of breathing in and measuring, you breathe out. He said it wasn’t a have to do but a good to do. Keeps the lungs open and moving air. I keep by my bed and use it when I think of it but ideally should be doing it a couple/few times a day. Takes minutes, that’s all. Bought it on Amazon.