Thanks to the proliferation of smartwatches and fitness trackers, it’s never been easier to log your heart rate while running ...

Thanks to the proliferation of smartwatches and fitness trackers, it’s never been easier to log your heart rate while running: Simply don the device, start your workout, and watch those beats per ...

In this era of fitness trackers, we have easy access to our heart rate at any given moment. Every so often, a number catches ...