Mini catapult... this could be something really fun to make for a lesson that is a collaboration with a history class. Students could make this one, then take what they learned to design a different one! This definitely promotes students' skills in analyzing, problem-solving, and collaboration with each other!
Caterpillar Race....Have your kids form teams (At least two) and form a straight line. In between each player is a balloon and they must get to the finish line without dropping their balloon. They can only keep their balloons from dropping by using their chest and the other players back. If a balloon drops, then the team must stop and pick it back up.