I've been to many high school and college XC and track meets and have seen many people collapse at the end of a race. The ones who don't collapse viciously pant for breath and struggle to continue standing. And I know that when I race hard to the finish I'm dead when I get there. But if you watch any elite races, they're FINE at the finish line. Even in a sprint to the finish in the Olympics! It doesn't make any sense! Can anyone explain this?!