Quote: (Originally Posted by
daviddem)

Yes I know it is 42k, but that phenomenon known as "the wall" happens at around 32k. It takes a lot of will to continue from that point, better be psychologically prepared for it. Physiologically, it has something to do with having burnt all your sugars and switching to fat burning.
Common advice is also to stop training a few days or a week before the event and load up on carbohydrates.
Depends-there are good carbs and bad carbs. Eat nuts , fruit ( tons) and veggies. Avoid Sugar as it builds up lactic acid which gives you the "burn". I am not a specialist but I find that if I avoid sugar , I perform a lot better... and can lift more and run faster longer without the pain I find that a heavy workout session before dive day is also great.