Eric,Next to meds and the use of my vest, exercise is the most important thing in my day. As Diane mentioned, biking is an excellent exercise, whether in or out of doors. Within the last few years, I have had the fortune to recover previously lost lung function and I hold exercise largely responsible. I try to do something everyday, and tend to get pretty grumpy if I miss a day. The toughest part is pushing myself out the door when I am not 'feeling like it'. Having friends that have been willing to coax me at those times can be invaluable. Not to mention that sometimes, a stiff cup of coffee is required to provide my motivation. One excellent benefit, besides helping to clear my lungs, has been the ever cumulative energetic boost. Going from feeling exhausted to feeling exhilarated is quite outstanding. And always more than worth the energy expended. Good luck.John. g. 40 w/cf