Yes, it is the flexing of the shoe that is the main cause of using up the life of a shoe. And this applies regardless of the surface.
Running outside may well be on a more abrasive surface, but unless you are scuffing your feet, you will probably use of the flexion and compressability of the show, long before you wear down the external part of the sole.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0