Your heart rate can tell you more about your workout than speed, distance, or calories burned.

Today, runners can track everything from stride length to sleep cycles, recovery scores to training readiness. The market is flooded with tools that promise insight, optimization, and marginal gains.

Runners, cyclists and gym-goers with wearable fitness trackers are no doubt familiar with the five "heart rate" zones. Ranging from low to very high intensity, these zones are calculated as ...

Aerobic decoupling (also known as heart rate drift) is one of the most useful metrics that many runners have never heard of.

Zone 2 dominates the heart rate training conversation. It’s the backbone of the 80/20 rule. It’s where you thrive on easy runs. It’s the effort level you’re told to lock into for long runs and ...

These features are great if you're training for a big run, trying to get faster, or just aiming to improve your overall shape ...

Hyrox knows how to test your weaknesses, whatever they may be.

Apple Watch software got little airtime at WWDC, but between AI upgrades, health features, and UI changes, there's still a lot I’m hoping to see fully realized.

Changes to the heart linked to marathon running vary by age, sex, and training level, finds a synthesis of the available data ...