Kinect fitness games

What are your favorites?

I have a gym membership but I'm still not working out as much as I want and I'm only able to go to the gym 3-4x a week. Next week my son has the whole week off school so I wont be able to go at all. I'm thinking i could pick up some fitness games to do at night or during nap time.

I have been looking at Nike fitness, Biggest Loser Ultimate Workout, UFC trainer and Zumba Core.

The nike fitness and Zumba one have demos so you can see what its about.

I have the Biggest Loser one and it is pretty good.