The polar a300 with hrm is a great watch that has been designed to keep you moving and made for all day use the polar a300 is a fitness watch and tracker that makes you move and achieve more track your daily activity training and sleep every bit of movement counts the a300 shows your steps distance calories burned and will also motivate you to reach your personalised goals you are able to connect a hrm belt to the watch so that you can train to your own heart beat this enables you to t