Now heres a question. If you're not a sports scientist that spends all day with these things then how do you know whether you over or underpronate? The shape of your foot might suggest what you MAY be doing, but how do you know? Is the average runner supposed to look at fellow races and say "excuse me, you seem to be rolling around a lot, could you tell me you type of pronation so I have a point of reference please?". The whole thing seems barking to me - the only way I found out was when I was injured and went to an expert. Over-pronate? relative to what?