I'll start and I'll only touch on the swimming for fitness aspect since that is all Sven mentions. You need both interval training (explosive) and distance training (endurance). Although the sport is a series of explosive plays, it does last for 30 minutes. Failing to train for the endurance will cause you to fail at the end of the games. The key is to find the right combination. Too much distance and not enough speed work will make a methodical but slow approach to the game. Too much speed and not enough distance will create holes in your team as recovery becomes an issue.

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Just in case you weren't sure, it's official -- CMAS sucks.
Oh yeah, and now they're broke.