Trainer stands at the net with a ball sticking out above the net
Attacking run-up (short-long run) and watch arms swinging
Make an offensive jump and try to touch the ball with the batting hand.
Watch out:
good posture
good height
arms well up
Put down the close pass (brake pass) properly
You can do this on both sides of the net, see picture. When you have completed the attack, pick up your ball and join the back of the line at the pawn.