Make a two-zone play area that is separated by either a low net or a ‘no-go’ gap/area (the wider the gap, the higher the imaginary net)
One team in the zone on one side of the net or gap, the other team opposite them in the other zone
Send the ball over the net trying to achieve the highest number of rallies
Decide on rules – how to send and receive, how many times the ball can bounce, can you send it to your team mate, who starts the rally and how, can you play the ball from outside the zone, etc.
Start by co-operating between the two teams, then compete against one another