I've been going to a chiropractor for a few weeks now and have discovered some completely new information about my body and how I hold it in space.
Today, during my chiropractic appointment, my doctor tells me that my right foot tends to pronate, or hold my weight more on one edge rather than an even distribution across the 3 major points of the foot [namely, the mound of the big toe, mound of the pinkie toe and center of the heel - creates a triangle] I have the unhealthy habit of wearing [cute] ballet flats which have no way of supporting or enhancing my standing and walking habits. He could tell by the wear on the sole of my shoe that I was a pronator! As I did some research online, I found that I actually "underpronate," which causes stress on the lower leg...maybe the reason I used to get shin splints?... I don't know :)
So in yoga, [think Mountain pose] it is essential to bring the physical body to neutral, and do our best to bring our mental focus to neutral. When we do this, we communicate to the nervous system that we are safe and can begin to restore and repair on both planes. From this place of neutrality, we can then begin to condition specific aspects of the mind-body that we know [through self-study] are our challenge.
Take a look at the link above for some interesting self-study. I'm not really promoting self-diagnosis here, but maybe the information will lead you to discover a small detail worth considering next time you step on your mat, or buy a pair of shoes.