I'd make fun but my roomy used to do it all the time (he owned his own little step pad and everything) and he was one of the skinniest guys I know. And it's not like he worked out like mad... the DDR was about the only working out I knew him to do... that and softball.
They have one of these at the Y we go to, my kids love it. Better than sitting on their sedentary ****** at home playing video games. They actually work up a sweat doing it, fight for turns, and have a great time.
DDR, i remember me and a buddy were talking about computer parts and i saw "yes its DDR" and theis cowoker (girl) jumped in with "i love dance dance revolution"