But how do we teach the fore and backhand shots and one and two hands etc. You can try it with a ball like people suggest but that's not how people normally throw a ball so it feels forced. Then An inspiration popped into my mind, these shots are the same as throwing a frizbee. When I compare the movements of my arms, shoulders, hips, legs etc from throwing a frisbee and hitting a fore hand backhand I could find that they were really simlar and that one would help the other.
I could learn to throw the frisbee further and with less risk of injury in the same way I could learn it about a ground stroke.
So now I can teach these basic skills with simple games. I can throw balls to practice overhead or underarm shots and use frisbees to practice groundstrokes. If they throw to each other they can practise the catch and throw cycle of a groundstroke rally.
If I could find a toy that I can use for both then I'm sorted