Your whole team starts on one side of a volleyball net, so there is no-one on the other side. The object is to get your whole team to the other side of the net.
Using a balloon as a ball, each player volleys the balloon to another player and then scoots under the net to the other side. The last player to touch the balloon then taps it over the net and scoots under. The receiving players try to keep the balloon in play and repeat the process. This could also be done in teams. Each team has a turn and the time is kept to see who can get their whole team to the other side in the shortest time.