Anyone who is serious about fitness knows that a heart-rate monitor is an absolute must. It allows you to know whether your heart rate is "in the zone" for optimal cardiovascular performance. Too fast or too slow, and you will not realize the same benefits from your hard work. The Polar F11 heart rate monitor wristwatch is more than just a wrist-strap heart monitor watch. With its variety of innovative features, it is actually more like a constant workout companion.
