We've added in some gross motor exercises during our circle time. See if your child can show you the dog stretch, superman, and bicycle (or turtle). These are exercises that both strengthen the core and help their brains cross their midline. When children have strong cores, they actually tend to have better pencil grip. When they can successfully cross their midline, they can successfully read and write from left to right, or whichever way one's culture requires. And of course, with stronger cores, they can sit up for longer periods of time when it's required of them.
A little midline crossing poem we've been saying is:
Yellow the bracken, golden the sheaves (cross arms at head)
Rosy the apples, crimson the leaves (cross arms at chest)
Mist on the hillside, clouds gray and white (cross on lap)
Autumn good morning, Summer goodnight (open arms, then bring hands to lap)