
The thing about walking long distances is this: it hurts. You may not think you could genuinely injure yourself from walking, but that’s probably because you haven’t walked enough.
Perform any repetitive movement enough times in the wrong context and things you have never even considered as necessary to your health and well-being start coming into play. Perhaps your shoes are very slightly the wrong size, and that 2mm give means that they begin to rub – not much, but enough that by the twenty thousandth step your feet are starting to blister. Or perhaps they’re not padded enough, in the places where you put your weight.