2 rows of children. Trainer throws the ball to the player and the player catches the ball via oh technique. So with arms extended and hands catching the ball. Trainer stands in front of the net and player in the back of the field. They throw the ball back to the trainer via oh technique and then touch the middle line and go under the net. There is a bench there which they walk over and then along the field back to the line.
Idem, only now they pass the ball back to the trainer. Pay attention to the outstretched arms and that they hit the ball low. Keep your knees and buttocks back. If they stand up straight, they hit the ball too high and it will hang or go over their head.