A higher number will make exercise feel easier at a given intensity level.

High-intensity interval training is important, but coming back to your breath can be crucial to helping you train.

Running to the best of your ability can feel like a numbers game. To hit new PBs, you’re probably under the impression that you should keep tabs on all kinds of ...

I'm what I call an "on-paper" athlete. I've been running for a decade, I regularly take weightlifting classes, and I finished a marathon. In my mind, I should be ripped, shredded — all the paper ...

These brief, intense workouts can strengthen your heart and boost longevity.

Essentially a measure of your cardiovascular fitness or aerobic capacity, your VO2 max is often considered a must-know metric if you’re a runner – especially if you’re looking to improve your running ...

Here’s a graph showing the fraction of workout time spent at above 90 percent of max heart rate (black bars) and above 90 ...