That tension becomes especially clear with heart rate zone training, a popular five-tier system that endurance athletes use to measure effort and fine-tune performance. The well-known formula is ...

When Joe Driscoll toed the line at the U.S. Men's Olympic Marathon Trials in November, he knew that maintaining an even pace would be trickier than usual on the rolling hills of New York City's ...

Not that it was ever unpopular, but it’s fair to say that running is going through somewhat of a renaissance right now. Data released by Sport England in April of this year revealed that 250,000 more ...

You likely know the importance of zone 2 training—low-intensity miles that are the foundation of distance running plans. The challenge? Finding your personal zone 2 range, and sticking to it. That’s ...