Heart rate is one of the most valuable physiological metrics for runners because it provides objective real-time insight into how hard your body is working. Unlike pace or distance, which are external ...

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 ...

Want more tried and tested recommendations from the RW editors? Sign up to our new weekly newsletter Kit Bag. Click here to subscribe. Training smart means mixing up the intensity of your runs – not ...