Even though we take breathing for granted, it is interesting to reflect that we share the air with all humans and many other life forms on the planet. The process of respiration shows us an oneness with the trees and other plant life as we have a symbiotic relationship with them through the oxygen and carbon dioxide exchange. This connects us deeply with the ecology of the planet, as well states of Being.
We are not only what we eat; we are also what we breathe. Any problems with breathing will affect all other systems in the body. This means that two of the best preventative health considerations are regular exercise (even if it is only walking) and proper breathing of clean air.