Ph D Fitness Overview For training your way. Need some motivation when training? Not anymore. The great looking F7 is all the encouragement you need. Thanks to the unique Own Zone function it tells you how hard to train to get optimal results based on your current physical condition. You can check the calories you’ve burned, too. Depending on your body s daily condition, you might benefit from either a low or high intensity training session. Polar F7 heart monitor checks your daily condition, & guides you to a suitable intensity. If you want to be sure that you are training at the right intensity, Polar F7 is the right product for you.