Correct Response: C. A pedometer records the number of steps taken by the person wearing it and can be used to estimate distance covered based on the length of a person's stride. Pedometer users are often motivated to achieve a certain number of steps per day or to improve their daily average. A heart rate monitor (A) indicates only the rate at which the heart is beating, an elliptical machine (B) is an exercise machine that can be used to develop lower body strength and endurance, and a bioelectrical impedance analyzer (D) is commonly used for measuring body composition.