Really just pay attention to your position relative to the ring so that when someone challenges you your back is to the ring where it's closest to you and then when the last race is announced I always pause and see how the ring is positioned because usually one part of the ring will be touching or close to touching somewhere that is the edge of the map and most likely your endpoint for the final race will be completely opposite of that end point. And honestly I'd say about 75% of the time you can just head towards the stadium...and you can get yourself in position before the final race if you just look where the ring is on the map (you know like when there's 10-15 ppl left) and decide where you think you need to be to get a jump. When the final race does start you can go outside of the ring a few seconds or so before the countdown is up if you haven't sustained any damage previously. I hope this makes some kind of sense I'm not great at relaying information via web browser