Here's a set that was tossed out to me and I thought would be fun, at least from a coach's perspective...

500 yards. Underwater. Full on Sprint. Go as far as you can on your starting breath. Take one breath and repeat going as far as you can on that one breath, repeat, repeat, etc. Curl at the T before the wall with no push off, only kicking. No breathing at the turns. When I heard it I thought I might try it for 200 to see what it might be like. I imagine the first 100 would be fairly fast followed by a survival 100. Obviously I don't think I'm in shape. Haven't tried it yet so I don't know. But I like the concept.

Duck

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