One commonly walks only limited distances. What is a long walk for you? A mile? Half-mile? Ten miles? Whatever it is, your body adapts to your foot-milage pattern; exceeding accustomed mileage activates the over-mile effect.

One can exceed one’s habitual or often-done mileage by the simple expedient of putting one foot ahead of the other. It works. However, it only works on the flat road. Even a curb can become a minor challenge to negotiate. Uneven ground more so, and downhill grades. One has to slow down. This is the over-mile effect.

— Bruce