Watch U.S. Olympic Kayaker, Brett Heyl, explain how he's able to shift his weight onto his right butt cheek while maintaining his center of balance directly over his left butt cheek. I bet he's got the Wii Fit age of a 16 year old.
Also, how great would a kayak game be on the Wii? Plant your butt on the balance board and use a specially designed Wiimote paddle. That would be the bees knees.