We haven't actually tried any excersizes per se, but we have been "playing around" with Bryce in the water just getting him used to different situations. He was scared of going into the water at dark, and so we've practiced with that, he also prefers rough conditions now (the more wind, rain and waves, the happier). He's not old enough to actually pull too much, but we kind of play with that too, Rob will hang on to his harness and paddle beside him while he play pulls. We will be going out on an inflatable and when he's okay with it, then we'll be tipping it (brrr, brrr.). Just little things in the water we're hoping will lead him up to big things someday. He's also seen strangers in the water in suits, but so far he won't swim out to them, he sticks close to us.
It would be great to hear from others who have actually gone through these practices in real.
Robin
