Arrange teams as in the overhead passing relay and space the players at arm's length apart. At the signal the first player of each team passes the ball back over his head to the second player, who passes it back between his leg to the third, the third player over his head to the fourth and so on. When the last player gets the ball, he runs to the turning line, returns and takes his place at the head of the line and starts the ball passing back again.
Ball
6-10 players per team
Make sure to explain rules clearly before starting. Divide players into equal teams for fair competition.