I play CM for my University (obviously not at their level, but at University level), and recently we had a cup game that went into extra time and it was pretty hot (even in Scotland).
Its amazing to see players sustaining quality at that level of intensity, and in that humidity/heat well beyond 100 minutes. Still being able to make the passes, runs and turns that they were making.
Such passionate play.
I'm sure anyone else who plays football will agree with me.