“It’s a parent’s job to teach their children skills that will help them in life.”

One of those skills is to sit still.
http://thedomesticfringe.com/no-fuss-parenting-teach-kids-to-sit-still/

I received this article from a grandparent who wrote this comment to...

"I forgot this can be done – as a parent I did it. I taught it to them. But as a grandparent, I have taken on the more ‘they can’t be expected to sit still’ approach. Worth the few minutes to read it!  And a good reminder to us grandparents!"