Children Can't Sit - The Evidence

When I am in class, I often have to tell the Primary 1 and 2 children to sit on their chairs. I will ask them,

"I didn't punish you, why are you standing?" or
"Do you have a porcupine on your chair? Why can't you sit?"

Then when I am back home, I see my two children not sitting too. When I revise some work with Phoebe at the dining table, she will sit on the edge of the chair for a minute and then for the next minute, she will be standing. Haha. Why can't children sit ? I guess it's either

1) They are always on the move, or

2) The height of the chair and table is not in proportion to their body size.

I just think it's a combination of both reasons! Verdict : The Bouncy Butts Can't Sit! Haha! :)

Each one one computer, no fighting, no issues... :)