Large inner tube,masking tape
Place an inner tube in the center of the room. Place a strip of tape on both sides of the inner tube approx. 6 feet apart. Separate children into two teams smallest to biggest. Have one child from each team get into the inner tube together. Have the children try to pull the inner tube over their team's piece of tape. Ask the winner a question regarding the lesson. If they get it correct than the player from the opposite team comes over to their side. The team with the most players at then end of the game wins.