http://www.rafiqsonsonline.com..../product-category/me HOW POLAR WATCHES WORK. The principle of operation of Polar watches is based on the analysis of the heartbeat (pulse) - the most important indicator of a person's health. In order to monitor the current sports load, owners of POLAR heart rate monitors just need to put on the chest strap, enter their physiological data into the heart monitor and start training. Monitoring data is reflected on the watch display. Thanks to this, athletes, without stopping from classes, have the opportunity to timely adjust the intensity of training, avoiding overloading the body, and improve their health indicators from class to class.