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

Add Yahoo as a preferred source to see more of our stories on Google. VO2 max testing requires a mask to measure oxygen intake and carbon dioxide output to determine your cardiovascular fitness.

The V stands for volume, and the O2 stands for oxygen. VO2 max is a way to measure the maximum rate of oxygen your body absorbs and consumes during exercise. It might also be called your oxygen uptake ...

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

A higher VO2 max translates directly into enhanced physical performance across various activities. This improved oxygen utilization capacity manifests in multiple ways. Athletes with higher VO2 max ...

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

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Pushing yourself too hard could actually be stalling your progress.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Whoop, the screenless ...

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

When you think about how fit you are, you might think about how far you can run or how many push-ups you can do. Or maybe you think about health metrics like your resting heart rate or heart rate ...