Whenever you are training for any sort of athletics, a Polar Wearlink heart monitor is an all-important tool. With a heart rate monitor, you can either measure your heart rate throughout exercise, or maybe record it for study at a later time. How can this be crucial? When your heart is beating normally, it gives oxygen to the blood in a more effective manner. Oxygen consumption is closely relevant to heart rate; the harder you push, the more oxygen your body and muscles require.