Sorry I didn't mean it like that, I meant the head is the end closest to King Yemma's, and the tail is the end closest to King Kai's.
EDIT: Are you going to be able to fly along this? I remember Goku didn't because the whole point of it was a training/endurance test and if he flew over it it would hardly train him, but players, unless they get stronger from running, would probably opt for flying.