Wii Fit, anyone?

I am thinking of buying the Wii Fit package. It has programs for Aerobics, Yoga, Strength Training, and Balance. Also has some fun-looking games. I am tired of no-fun exercise, and it gets so durn hot in Oklahoma in August that doing things outside is just no fun (it's been 104, 105 here in the past two weeks or so).
I want to do something fun, ya know?
Any thoughts?