Pronate or Supinate
I’ve been told by one person that I pronate (this person happened to be a salesperson at a shoe shop). Another (a pediatric physician) that I supinate mildly.
I’m inclined to believe the doctor. Unfortunately, I talked to the salesperson first, and have, for over a year, been running on shoes for mild pronators :(
In any event, if you are asking yourself whether you are a pronator or supinator, please see a specialist for a formal diagnosis.
For the impatient, here is a good article on the topic:
http://www.offnrunningsports.com/shoe_reviews/choosing.htm
This article covers the basics of pronation, and has a test you can do to tell whether you are normal, a pronator, or supinator.
It goes on to describe the best running shoes for your foot type.