I do Zumba 3 days a week. We do it in the basement of a local business so there are no mirrors. I honestly believe I look JUST like the instructor when I dance.
FYI-there are no dudes there (like this pic) and we don't wear those outfits (scary) but I am seeing a significant difference in my body. I've really been enjoying it. I get up at 5:30 AM with no complaints! Awesome workout if you love to dance!