Students write letters to another class giving directions on how to find your lung capacity. Invite older students to demonstrate how they breathe when playing the instruments. Provide harmonicas, penny whistles, recorders, and kazoos and challenge students to perform a tune. Students describe orally what differences they noticed between regular breathing and breathing to play a tune. Pictures and ads can have anything to do with lungs and oxygen, including cold and cough remedies, air pollution, smoking, and so on.
Students meet in small groups to compare the things that they found to aid or hinder breathing.
Students propose solutions to the things that they found that hinder breathing. Have students make up riddles about the heart, lungs, oxygen, blood vessels, carbon dioxide or any other body concept that's been covered. I enter your lungs when you breathe in. Your body needs me. Have students present the riddles to a small group or to the class.