Effects of shaking your legs?

Do you know when people sit and shake their leg up and down when they sit? Well, I did it. One jerk in my class does it but its natural. Hes really annoying with it so I decided to do it back. I was shaking my leg for 10 minutes in a row. A lot. But it wasn't natural and now I feel weird. Was this the cause?... show more Do you know when people sit and shake their leg up and down when they sit? Well, I did it. One jerk in my class does it but its natural. Hes really annoying with it so I decided to do it back. I was shaking my leg for 10 minutes in a row. A lot. But it wasn't natural and now I feel weird. Was this the cause? Can you tell me some effects of this?
3 answers 3