I have COPD. I smoke for 37 years; 2 to 3 packs a day - I was the Marlboro man. I stop 14 years ago and COPD came on a few years later. Now I have moderate COPD and I take daily Spiriva & Advair. My condition seems to be maintain but I run out of air capacity when I do cardio. How can I increase my air capacity with my remaining functional lung capacity?