Why so serious?

Went to Zumba for the first time with my flatmate tonight, it was good fun, but a lot of people seemed to be taking it much more seriously than we were...it seemed to involve a lot of Egyptian mummy style moves which we found quite amusing! It actually seemed like a reasonable workout, when we weren't tripping over our feet and bumping into each other!

Unfortunately all I could come up with is a fairly grotty picture of my trainers to represent this!