OK, so under the subliminal influence of this forum, I have metamorphosed from someone who just wanted to find out more about barefoot mechanics to fix a threatening bunion into an Actual Runner. (In much the same way that my teenage son poking a piece of bacon around in a pan is an Actual Chef, but it's a start.)
I have downloaded a couch-5K app for my Android phone and have done the first two walky-runny sessions. Actually, I did the first one with an ipod touch app and then realised that as I had GPS on my phone it made more sense to use that and get a map and stats. (I like stats<g>. It's part of the genetic combo that comes with my long fourth finger and my slight Morton's Toe, I believe. The too-much-androgen-in-the-womb bit that once made my husband say with all seriousness...
You go to your doctor and they say, “Your feet pronate too much or over pronate.”
I'm sure that is what someone said to you which prompted you to google this article.
There are many ways to describe over pronation but the way I describe it is when the foot rolls outside a range I call the safe range between rolling from the outside of the foot to the inside of the foot.
This is what many call over pronation, excessive pronation, hyper pronation or sometimes called fallen arches.
Have you been told by your doctor that you have flat feet? Or do your feet supinate too much which is called over supination or...