When my wife told me she got a polar heart rate monitor for my birthday, I was verry happy! I’d had one for years, unfortunately, I lost it and was debating a replacement. So this news, of a bonafide Polar heart rate monitor, was simply perfect. great for the Gym The polar heart monitor range and F55 I am a keen runner and regularly attend exercise classes at my local gym. Someone recommended to me that I should start using a heart rate monitor to improve my performance.  After looking at all the different brands I decided to buy a Polar heart rate monitor.