I never ran through a pair of sneakers before. Today was my first run in my new Nike Pesasus running shoes. I had about 360-370 miles on my old Nikes and I was starting to get some soreness in both legs, not just my left. Everything I read online, as far as running experts goes, said that you should replace your shoes between 350 - 500 miles, and that if you were heavier or ran a good deal the sooner the better. What I didn't realize is that I needed to recalibrate the Nike+iPod, but after today's run made a lot more sense. I had a great pace going from start to finish, probably my best since I started running in the park. I was really psyched to see how I did, but because I didn't recalibrate the Nike+iPod my pace recorded by the Nike+iPod was horrible and obviously way off. I recently had been pacing regularly under 10 minutes a mile and today's pace felt really good maybe even 8 minutes a mile or so I hoped. Oh well, I know how well I did and that's what really m...