Polar watches are, first and foremost, heart rate monitors. They can track your heart rate whether you are running, walking, swimming, etc. Through the use of on-board software, a Polar watch can also tell you your running power as opposed to your walking or swimming power. Polar watches can be utilized with a customized training plan that can help you reach all of your targets – as you work out. Display screens are also customizable through the Polar app.