Heart rate tracking is increasingly common among fitness enthusiasts, and understandably so. Whether it is a rugged outdoor smartwatch or a discreet smart ring, smart wearables can help you determine if you exercised hard enough, rested well during sleep or stressed too much during the day — simply by listening to your heartbeat.
Some of the best fitness trackers can even use machine learning to give you detailed exercise recommendations based on how your health metrics change over time — not to mention that smart wearables can be invaluable tools for endurance athletes. But how do fitness trackers measure your heart rate, exactly? And how accurate are these measurements? We asked the experts.
