The idea I had for rowing was simply to use two Wiimotes, and get the timing right. Depending on the setup of the crew, either use them in time, or out of time (and in time with the other members). May not be great, but it could sort of work. (Wii Tennis isn't so much about the power or strength, as it is about timing and placement).
Gesta Non Verba
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Wii code: 2263 4706 2910 1099