What Do Aliens Think of the Zumba?

Let’s say that an alien has come to Earth on a research mission. He wants to know what Earthlings are like. So he gets a furnished apartment, he arrives in secret, and he let’s his home planet know he’s made it to Earth safe and sound.

He knows almost nothing about Earthlings, but he’s all ready to learn. So he turns on his TV and sees this:

[youtube http://www.youtube.com/watch?v=bS_g0-QWeek?fs=1]

What the hell would he think of humanity? What do you think his first report back to his planet would say?

[I chose Zumba for this post, but really any workout video/commercial could work just as well. Am I the only person fascinated by those things?]