When we exercise, our heart muscle becomes stronger, because it has to pump harder and faster 4. Students demonstrate how physical activity affects the heart. Have students walk briskly around the room for two minutes. Then have students jog in place for two minutes. When they have stopped, have them place their hands on their chest again to feel the heart beating.
Students identify favorite activities.
Pass out construction paper and crayons. Ask students to draw a big heart on the paper. Have students draw a picture of their favorite exercise in the middle of the heart. Reflect, summarize and discuss. Ask for volunteers to show the class their hearts and talk about their favorite activities.