Gangnam Style is great! It's not too hard, but is quite a workout. Mind you I'm only playing on Easy so far. I started on Beginner, which may actually be more of a workout than Easy as you do fewer moves, but each for longer stretches. It's a lot of fun. I could only do it 4 times before I was ready for something much less of a workout so went back to DC1's Poker Face. LOL. Yeah, I'm not in the best shape. Yet.
I'm looking forward to trying it more.