Be careful with DDR. There's a lot of stomping involved, and if you just come crashing down on your feet, the joint impact is much worse than walking or even sprinting.
I damaged my knees pretty badly playing DDR several years ago; I'd cleared all the 9-foot songs and was working on the 10-foot ones, and noticed my knees were starting to just spontaneously bruise, bleeding internally, even when I was just walking around during the day. It's taken me years of yoga and physical therapy to understand how to take care of my knees so they don't act up, now, and I actually think DDR caused a lot of cartilage loss and probably ligament strain.
When I told my orthopedic surgeon what had caused my injury, years ago, he said to me, "Oh, DDR. I hear that game is pretty popular... with teenage Japanese girls."
And then he couldn't stop laughing.