I found out recently that I overpronate, and its probably what has been causing my shin splints and ankle problems. I normally feel pain PRETTY quickly into a run, within a couple of minutes, but by the end of my 20 minute jog, I still felt great. I could have kept going (except my heart was pounding so much hehe) so I walked for another 20 minutes. I've been out a few more times and I LOVE these shoes. I may have to buy a couple more pairs for when these wear out.