heart rate Centers for Disease Control and Prevention manually measure your pulse subtract your age from 220 The Centers for Disease Control and Prevention 70 to 85 percent of your maximum heart rate target heart rate The Center for Disease Control heart rate target heart rate CDC website CDC website Target Heart Rate and Estimated Maximum Heart Rate moderate-intensity exercise CDC 60 seconds raise your heart rate CDC website 60 seconds heart rate Target Heart Rate and Estimated Maximum Heart Rate Target Heart Rate and Estimated Maximum Heart Rate CDC