Just an update.
I got Exerbeat for our Wii system, and it starts a little too advanced for me (65yo, a little overweight, and I never could keep up with everyone else in those step exercise classes offered by the Y and community centers). LOVE the pirate game on it, though! So, I just ordered Dance Dance Revolution Hottest Party 3 Bundle (after making sure it was compatible with our version of the Wii console). I think it will help with balance as well as aerobics.