You can also try pulmonary rehabilitation. Its a program that you need a doctors referral when you start the first time— three times a week an hour including a warm up then 15/15 minutes of exercise you pick and 15 min of calming down. In the meantime your blood pressure and o2 level are measured a few times watching your vitals. This is usually two months. If you decide for more and you qualify you pay 100 dollars a month- the difference is you monitor your oxidation level after each set of exercises. Of course all this if there is a program like this that your local rehabilitation program offers.