Training smart means mixing up the intensity of your runs – not just going out all-guns blazing on every effort. But distance, time and pace are all blunt tools for measuring effort, which is where ...

Tracking your heart rate with a heart rate monitor (HRM) during your runs is one of the most powerful ways to optimize your training, whether you're a dedicated marathoner, power triathlete, or just ...

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The top heart rate monitors provide the best accuracy — but also comfort and convenience. Explore the best options in this guide. The best heart rate monitors are accurate, comfortable, and offer ...

Tracking heart rate is a huge feature of Fitbit’s smartwatches and fitness trackers – and drives the data we demand from our wearables. But how does Fitbit track heart rate, what features does it ...