I can't seem to find the wisdom in the advice of other's when they state that physical preparation of any kind is really not necessary for a thru-hike, one needs only to arrive at the trailhead with their "head straight", that the mental aspects of the hike far outweigh any physical advantage one may begin with, and that they will eventually just get their "trail legs". To me this flies in the face of conventional wisdom and would seem totally detrimental to arrive in such a slothful condition to begin such an arduous journey. I was wondering what are other's thoughts on this?