I'm no expert, but I love these shoes. I've never really been much of a runner (hated it, actually) but armed with these shoes and a good Couch 2 5K app on my phone, I now am a regular runner. I'm now on my second pair of these shoes. They are so comfortable that I'm able to push myself to the point where...I actually *enjoy* going for a run. Thanks Mizuno for making a shoe that made me like to run.