Trainer stands in a corner of the field and has some balls.
The 5 players are standing behind the back line and 2 of them run in as soon as the trainer bounces the ball hard.
Trainer bounces the ball in the field and one of the 2 players starts to play the ball OH.
The other player runs in and plays the ball BH again to player 1.
This player catches the ball, hands it to trainer and walks outside the field to join the back of the line.
In this way you think about safety and you can continue at a high speed. This exercise can also be adapted to the person who catches more easily or more difficult.
Depending on how it goes, bounce easier or harder.