Light exercise from a simple game. Getting the balance board is worth more then the "Fit"ness you'll achieve.
This has it all, from aerobics and yoga, to standard workout tasks such as push-ups, sit-ups, leg lifts, etc. within strength training. The balance games side of it is more like just a step up from Wii Play with the balance board, so although it adds some entertaining diversity from the bland exercises, it also seems relatively useless on a fitness standpoint. I still can't help but feel it needs something more though if you really want an exercise program out of it, maybe along the lines of interactive mini-games that truly test your fitness level by making your character's survival depend upon how strong or aerobic you are. There's little motivation to improve beyond doing the same fitness tasks over and over. Aside from the capability to easily cheat on a task as mentioned in other reviews (which I don't know why you would do with such simple tasks), the only benefit to succeeding in the same task over time is slightly more advanced levels of the same task (i.e. more reps, longer distance to run in place, more time on the countdown before you complete a task). I just can't help but feel they could've done a little more to a very basic fitness-game experience. If nothing else though, you get the balance board, which on it's own adds a lot to the Wii and will be an excellent control method for future sports and action games to give you more of a workout then Fit will do.