I have the Wii Fit and the Outdoor Challenge. I like both of them. The Wii fit has 4 different categories (yoga, strength, aerobics, and balance games). There are several exercises in each category; stretches, side leg lifts, push-ups, sit-ups, hula-hoop, running, boxing exercise, et., and then the balance games. The Outdoor Challenge is fun too. You can actually do it with a partner. Me personally, I think the Outdoor Challenge is a little bit more physical than the Wii Fit. There is quite a bit to it to go into every detail, but there is a lot of jumping, running, a few that work your arms, etc. It does take a lot out of you though. I actually did it tonight, but couldn't do as much as I wanted cause my breathing wasn't so great tonight.
Hope that helps you a little bit. I would recommend it.