A competitive relay game.
To get as many tennis balls in your hoop as you can.
Divide the group into 4 teams. One hula hoop will be placed in the middle of the gym with the tennis balls inside of it. The other four hula hoops will be placed around the center hoop with the teams lined up behind their hoop (the hoops should look like the "5" on a dice). On a command, the first player in each line will run and pick up ONE ball and bring it back to their hoop. The next players in line will do the same, and so on, and so on. Once all the balls are gone from the center hoop, players can start stealing balls from the other team's hoops. The object is to be the team with the most amount of balls after a certain amount of minutes.
Have the children hop, skip, or gallop to gather the tennis balls.