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Your unexplained fatigue may be due to calorie deficiency, with serious implications for your health and performance

A leading exercise physiologist suggests developing a top speed two times faster than your marathon pace for a “speed reserve.” Here’s how to improve yours.

A new analysis of numerous studies sheds light on how, contrary to popular belief, running may actually build stronger cartilage. Here's what that means for training on arthritic joints.

5 facts about reducing training load and maintaining fitness as your marathon approaches. Plus, a proven 4-week marathon taper plan.

Don't just dominate the hills, conquer the whole course by running more strategically and finishing faster.

What if you had the chance to redress nature’s imbalance, change the luck of the genetic draw, level the playing field. What would you do?

A scientific paper predicts how potential future Summer Games host venues may become more and more constrained as global temperatures continue to rise.

The most disciplined runners know how to not to always do the max. Here's how to nurture one of the skills that can separate those who achieve long-term success from those whose careers are often plagued by injury. 

Debunking the myth that you are broken if you don't maintain contact with your competitors in a race.

Try this simple, fun, and effective structured fartlek to cultivate sprint speed and improve your 5k-marathon time.

When you're running in the heat, how much should you adjust your pace — and still get the same workout intensity? We dig into the science of swelter.

Want to break up a tempo workout and get all the benefits? Try these short cruise intervals.

As events as big as the Olympic Trials get rescheduled because of heat, we went to the science to find out how you should decide when it is too hot to run safely

Rules, rules and more rules. In the Olympics, you have to do more than just run fast to reach the finish line.

As events as big as the Olympic Trials get rescheduled because of heat, we went to the science to find out how you should decide when it is too hot to run safely.

The news of Shelby Houlihan's four-year ban created an outpouring of confusion. We waded through the science and research to help answer some of the top questions.

Spicy days are here, here’s how to acclimate to heat and get an edge on your competitors.

By hiding the finish line, the clever "whistle drill" workout forces you to push past your psychological limitations.

Try this famously fast and wicked workout used by Steve Prefontaine and Galen Rupp to hone speed endurance.

A test to predict what you could run in a mile race today, that doubles as a unique workout.

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