elliptical. Pulse oximeter used to monitor, Try to stay at 90+. I gained 45 pounds since I quit. Now have lost 15 through diet and exercise. I think the steroid in Advair has something to do with the gain. I just switched to Spiriva 4 days ago. I have noticed an increase in my O2 level at rest and exercise. Has anyone experienced similar? it is only 4 days and will continue to monitor, duh.