Is wearing the mask able to absorb enough oxygen for muscles, organs, and especially the brain?
Wearing the mask does not interfere with normal breathing, that which takes place at rest or during moderate movement, where there is sufficient oxygen for the body. It can certainly be more labor intensive during progressive physical activity, with the understanding that you are quite out of reach of other people and outdoors, you can resort to free breathing.
Asthma and weather: how to reduce discomfort
Temperature too high or too low, excessive humidity or
Dry wind, thunderstorms, chemicals and allergens in the air we breathe
act variably on the mucous membranes lining the respiratory tract.