How to shake your butt up and down?

Question: How to shake your butt up and down!?

http://www!.youtube!.com/watch!?v=b5Id4-h0t!.!.!.

in the end she does that

all my friends can do it and i'm like watching videos trying to figure it out!.

i'm really good at dancing & do hip hop & can roll my stomach but i cant do that!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

it's a contraction of the lower back muscles!. You can try that!. It might be dangerous though, if you don't do it right you can tweak your spine!.Www@QuestionHome@Com