Here is a blurb on The Breather: https://www.pnmedical.com/product/the-breather/ and how it works. I'm not sure what the spirometer is; but if it's that thing you blow into to make something rise, it is very different. With the Breather you inhale and exhale and can control the intensity of resistance as your lungs get stronger. They (PNMedical) have training programs on how to use it every month or so on the internet and an APP with coaching exercise programs. I learned so much valuable information from James Nestor's book Breath that this has prompted me to reread it again. Thanks. I do remember one thought that I hope I remembered correctly: SOB is caused more by too much CO2 in the blood rather than a lack of oxygen. That was a shocker, and I hope someone will correct this if it's wrong. You can do a Google search to read about the benefits of Pursed Lip Breathing and see how to do it. I do it when I get winded going up stairs or have overdone things. I'm going to look into that PEP thing Sue mentioned that sounds really helpful. Best wishes! Nancy