Not perfect, but a step in the right direction.
Basically, you need a Wii Balance Board to play this game, which kinds of makes it expensive. Is it worth the money? Not entirely. It doesn't help you lose pounds, and can get boring, after a while. Although, at the beginning, it is kind of interesting how it keeps records of your progress, and helps you set goals. But there are some problems.
For example, the Wii Balance Board itself. Sometimes, it loses connection to the Wii, and can be a little unreliable. And the games can be quite boring. And running in place on carpet can hurt you toes. But it does work up a sweat.
Overall, this is a good game, but Nintendo could do some things better. Perhaps in the future, it will be the future of work-out gyms.