Which pair can play the ball independently over the net most often?
The tennis players are close to the net.
You can make it more difficult by increasing the distance.
Between the two tennis players are 2 hoops, about one meter apart.
Try to get the ball into each other's hoop (who has the most hits).
More difficult: between both tennis players. each on one side of the net, on each side of the net 2 hoops (hoops must be in the same place on both sides)
Play the ball over the net and try to leave the ball in the other hoop.