Pulmonary Paper mentioned this talk by Dr Noah Greenspan on all things O2. This is an excellent presentation, in non technical terms. Very informative. The video runs about 2 hours.
A big take away for me was the level of that to increase your exercise level, you may need to increase your O2 rate. The objective is to work harder, do whatever it takes to increase your workout, so that your breathing improves. Therefore you quality of life improves.
GO to:
vimeo.com/327196321
Also consider monobio.com
pulmonarywellness.com & "/book" for Noah's book.
ed