What Kinect games are best for exercise?Dance Central 2, Kinect Sports (1 or 2), and Your Shape.
You're not going to "get fit" on a strict regimen of Kinect, but these games will help break a light sweat without feeling like exercise.
Dance Central 2 is the best game on Kinect right now (alongside Child of Eden and The Gunstringer), chiefly because it gets everything right. The controls are spot on, it's easy to pick up (alone or with friends), the song selection is intelligent, and it's just flawless. The original DC set the bar for motion tracking and felt the least like a proof-of-concept demo of the release titles. (The sequel is even better at handholding, less frustrating, and more enjoyable. It also has a fitness mode.)