Ever get knee pain? shin splits? hip pain? back pain? I have had all these. I friend of mine introduced me to Newtons. These shoes force you to become a fore foot runner thereby turning your calves into the springs they are supposed to be. I highly encourage you to check out there web site and decide for yourself. They have done wonders for me. BTW these shoes are only for running you wouldn't want to wear them for anything else. On the plus side many runners and get up to and over 800 miles on a pair.