The players spread out in the attack positions.
All the balls are placed on one of the wing positions.

The exercise starts when one wing makes a piston movement on the outside of the nearest cone and passes the ball to the backcourt player, who makes a piston movement ...
Each time the ball has been passed, the player runs backwards to the next position, i.e. Wing becomes backcourt and so on.
The opposite wing can either shoot at goal and the exercise starts again from the opposite wing or pass the ball to a CR, who runs to the opposite wing position and starts the exercise again.

The exercise trains the piston movement and especially the movement backwards to a new starting point.
The speed of moving backwards is very important for high speed of the ball in the attack play

Remember to practice both ways.