Harry has decided to pursue his dream of becoming a firefighter. In order to pass the qualifying exam, he puts himself on a rigorous training regime, including practice sessions on the stepmill machine. Using line graphs to chart his progress, he is able to reach the target rate that will enable him to pass the stepmill test. But he didn’t realize he’d have to take the test weighted down by full firefighting gear! Although Harry fails the exam, he shows a real knack for interpreting line graphs.