I picked up some 2 feet diameter inflatable balls at Wal-Mart a few years back and tried to come up with a game for them. This is what we did.
Set-up: Break your group into teams of at least 4 students. Each team will need one adult or trustworthy student to stand in the center of a large playing field. Scatter the lage balls around the playing field. Teams should stand by their adult holding hands in a circle.
How it works:
All students form a circle and hold hands facing inward around their hoola hoop. One of the leaders should remain with the group and the other leader needs to come and stand in the center.
At GO leaders will throw the large balls into the playing field. Teams must then run (while still holding hands) to pick up one of the balls They must keep holding hands at all times and pick the balls up using only their bodies.
Once they have a ball they must deliver it to you in the center of the playing field. When they do you record one point and then throw the ball to the other side of the field. The team with the most points wins.