It transmits the heart rate reading to the receiver which gives the heart rate reading to the user. The receiver is a wrist-worn device. This has several functions and features including the ability to send several exercise data like calorie burned, percentage of fat burned, and more to include time telling. This increases the risk of injury plus the given fact that they are not getting the right result equivalent to the effort they exert. With the heart rate monitor, the intensity of training is regulated to get the best exercise or training possible with the least amount of effort. If there is over-training, there should be under-training. And we will never be able to miss one day of training if rain begins to fall outside our windows. With treadmill, add we have to do is to step on it and off we go; no weather considerations, no outfit to match the cold, and no dogs to chase us while we run. Meanwhile if you think that treadmill alone would do the job of getting us fit, well you can set those thinking aside. The wristwatch heart rate monitor would not require you to stop and check your heart rate that often disrupts the should be continuous workout and consistency of heart rate. 2. Fitness monitoring. When you need a cardiovascular fitness, there is one part of the body you should monitor: the heart. And with the data a wristwatch heart rate monitor can give, you can now know the activity of your heart which would make you more conscious about how to train. Heart rate monitors come is different form but the most common is the belt chest heart rate monitor. The belt chest heart rate monitor however does not stand by itself. Since the belt chest contains sensor and a transmitter, and transmitters should have a receiver counterpart, the belt chest heart monitor needs a receiver in the form of the wristwatch. You should be able to know what are the features you need and what are the features you don t. By doing so, you can maximize the use of your heart rate monitor while reducing the probable cost of buying heart rate monitor with features you cannot even understand. Again, with all these features, getting the best heart rate monitor is not a matter of price and features, it is a matter of selecting the particular one that would suite your need without costing too much.