The Wii Fit Balance Board The primary tenet of Wii Fit is balance. Your center of balance, the point between your left and right sides when you stand upright, has a lot to do with your health. Those without an even center of balance will be unnaturally compensating for this imbalance, which causes their posture to become misaligned, increasing the possibility of putting unnecessary strain on their bodies. This is where the Wii Balance Board comes in.