If you tend to peter out on a lone outdoor jog or stroll, an indoor treadmill, combined with the charged atmosphere of a gym, can provide the motivation you need to log the miles you're striving for. People run in the mirror and look at themselves. Kalish isn't a big fan of the treadmill, but she recognizes its benefits. There are a ton of things that you can do on it. Whatever surface you choose, the most important thing you can do for your fitness program is avoid injury.
Stone recommends wearing relatively new running or walking shoes with shock absorbing soles.
He cautions against wearing sneakers with hard inserts. Choosing a proper surface can also help minimize stress on the joints. Stone recommends soft outdoor surfaces such as grass, instead of concrete or asphalt. The hardness of the running surface is even important when picking a treadmill. But you also want hardness so that you have enough surface to push off on.