Give each team a durable balloon which has been blown up and tied securely.
(Have extra balloons ready in case some pop!)
Teams stand in parallel lines, about 10-12 feet apart.
At the signal, the first person bats the balloon to the second person, who then bats it up, up and away to the third person until it reaches the last person.
If the balloon touches the ground, it's picked up and the game continues.