Pulmonary rehab has long been recommended  for those with a respiratory condition. Unfortunately many people don't have access to rehab either because of location or possibly for financial reasons. A study published on August 18, 2019 suggested that Inspiratory Muscle training might slow the progression of COPD for those who have not participate in a regular pulmonary rehab program.

Normal oxygen levels are generally between 99% and 95% during waking hours.  During the night your oxygen levels naturally drop because you don’t breathe as deeply while sleeping. Your oxygen saturation levels should ideally remain above 90%. If your saturation levels dip below 88% your doctor is likely to prescribe supplemental oxygen for nighttime use.  Many portable oxygen concentrators are equipped for use while sleeping.