I've played a couple of sessions of Your Shape now, and I'm enjoying it. It has everything from MMA like games to Tai Chi, as well as exercise programs. I'd have liked a more integrated approach, so I could put together a workout regime and it would just pick exercises to get me to my goals, but it's a little more granular, you have to pick each exercise set you want to do. (Beware, don't tell it you want "toning" unless you really love squats, my thighs still hurt...). I haven't found an option for "I want to be able to see my abs again", although I suspect the "Post pregnancy toning" might be it
The menus are easy to use, the game is executed very well. My only issues with it are the non-integrated workout system, and that it gets very finicky about how you do an exercise. I often feel that I've done a motion exactly right and it won't credit me. This is especially prevalent in the Tai Chi workout.