Wow! 5 miles a day is impressive. You are not the only one who finds moving to be the best method of airway clearance - with occasional (2-3 X week 7% saline) and puffing my Aerobika, I don't need much else. I alternate 45-50 minutes of yoga with walking to get my lungs pushing stuff out.
I did treat for almost 2 years - it was hard - but 4+ years of this method has kept me off meds.
Sue