I'm 42. I went to the dr about a year ago because of this. He gave me an inhaler prior to exercise. I used it off and on. Seemed ok I guess. This past weekend we went dancing. I was so winded. I'm maybe 15 lbs over weight. I eat decent. I hit the treadmill 3 days a week. 20 mins a time. I don't go all out on it however. I don't smoke. Ever. Normal moving I'm good. It's got me worried. Should I exercise a bit harder to get back the stamina? Should I go back to the dr? TIA