"But wait," you say. "I do exercise, so what about me?" The prevailing understanding of exercise includes the belief that exercise of any type improves the distribution of oxygen to all tissues, but this is not the case. Movement of any type improves the circulation (read: oxygen and waste removal) only through the muscles that are being used for that specific movement. Even if you're a great exerciser- -maybe you bike or jog religiously only the muscles you've used for that specific exercise garner any benefits. Over time, heavy use of your body in one particular pattern makes strong tissues next to weaker ones, which creates an environment where an injury can slowly develop. The frequent consumption of varied movement is what drives essential physiological processes. Movement is not as optional as we have led ourselves to believe. Just as a lack of food (or, heaven forbid, oxygen) leads to a multitude of biological signals and physiological outcomes, people are living in their body-houses surrounded by screaming alarms in the form of pain, illness, and disease, and they are unaware of the source of the problem. You have been doing the movement equivalent of under-eating and under-breathing, which is having an impact on your whole body, right down to the cellular level.

— Move Your DNA by Katy Bowman (Page 32)