Have you ever wondered why this is all the student will do??
Or they pull this lovely one?? (please please please if you are taking your child to a gymnastics facility, take them to a USA Gymnastics certified gym with certified coaches!)
I've even seen older kids do it. I mean, we've all seen it. The coach or parent just putting/forcing their kid through the motions. There's this fancy term called tonic neck reflex, which all humans have. It is a primitive reflex, which occurs because the baby's head is large and their neck is small.
Forcing a child to tuck their head under, will make them naturally snap their head back up. Why? Because it cuts off their airway! Wouldn't that freak you out too! It's not natural to want to do that.
So when they are ready, they will start to investigate. Show them the steps, but don't force. Look at my previous post for my quick steps to a proper somersault. :)