So, I took the dogs for a long walk today because the little one was driving me nuts and I wanted to wear her out. We walked a couple of miles, jumped around on rocks and I even ran some of the way there and back. It used to be when I ran, I felt like I was going to die. When I got back to the house I wasn't even out of breath. I never noticed how much my lung function had improved until I found I could actually run without gasping for breath.