In fours have two players on one side, the other two on the other side of the net. All of them make one team. Have the players on either side of the net face each other, with one player standing at the net, the other on the attack line. Player 1 then passes the ball to player 2 (who is standing nearest to the baseline on the opposite side of the net) Player 2 then passes to player 3 (who is standing facing player 2 on his/her side of the net). Player 3 then returns the ball back to player 2, who in turn passes back over the net to player 1. At this point player 2 and 3 swap positions. Player 1 then passes to player 4 (who is standing facing player 1 on his/her side of the net). Player 4 then returns the passes the ball back to player 1, who in turn passes back over the net to the player standing on the attack line.At this point player 1 and 4 swap positions