Volleyballexercise: keys

Emphasis on plank and from the knees, so arms stay still and don't rise above the shoulders!

Two teams with one ball and stand on the side line. Player 1 moves to the other side of the line, while checking. There you roll the ball back to player 2.

Trainers throw the ball to over the net and player tests the ball for himself. Catch the ball and bring it to the trainer and then join the back of the line.

If this goes well then try to key 2x, catch ball and via bra throw ball over the net. Then you dive under the net and get the ball and bring it to the trainer.