Mark used some of his birthday money to buy the Active Life Outdoor Challenge. This thing is a blast.
You use a mat, which comes with the game, and a controller for a whole body experience. There are games like jump rope, whack a mole, roller skating, mine carts and so much more. You can play alone (training, free play, or courses) or with others (competition where you each take turns, or head to head where you are both doing it at the same time, as well as cooperative play). We played for an hour last night and I am sore! Morgan was in bed while we were playing so she didn't get to try out, but I think she's going to be able to play several of these games.
There are only two things I have an issue with. The first is that the mat slides around. We put my yoga mat down and then the Wii mat on top. This cut down on the sliding, but we still needed to adjust the mat every so often. The second is that the mat buttons are pretty close together for head to head play. It would be fine for two kids, but two adults are practically on top of each other. This does make it easy to "accidently" bump into your partner, breaking their stride and enabling you to sprint to the finish line - but I would never do that.