Hi! I bought a breathing exercise product called The Breather on Amazon. I really believe it has helped strengthen my lungs. It also has an app with it. They also have a support team who will answer questions. I try and use it at least once a day. Also, check out Breathing With Elizabeth on YouTube. She is a respiratory therapist with a lot of knowledge and exercises. If you enjoy reading, Dr. Noah Greenspan has a couple of really great books about PF and pulmonary exercises. Also, google “ pursed lip breathing” which I use a lot when I have SOB. This exercise will not only strengthen your lungs but help you get your breathing back to normal. It takes a lot of patience which I guess is my lesson for this time in my life! 😁