Exercise is important. I am not able to exercise as much now, but I have always walked. I am waiting to get 02 and hope to get a portable until that will allow me to exercise. I also have an exercise bike. These are helpful and treadmills are too.
Weights can be helpful to keep strength up - even the small weights.
I've heard it's expensive, but try to get it anyway and my former respirologist recommended good nutrition. This includes a variety of foods, he said that nutrition is important to maintaining good health. Dietitians, especially those who work with people that have lung disease should be able to provide nutrition information. This is also something that you would learn about in a pulmonary rehab program. Most of all, please don't give up.