The show's called Dance Your Ass Off (I didn't know they could say @$$ on tv... but whatever) and it's on the Oxygen channel.
I randomly came across it last night for the first week's results show. Think a combo of Dancing With The Stars and The Biggest Loser. Here's a pic from last night's show:
If nothing else, it makes me wanna shake it like those women did last night, I don't know what would. To wiggle my butt just standing still - amazing. And some of them did the splits!!