Running at the best of your ability is somewhat of a numbers game. To hit new PRs, you’ll want to keep tabs on all kinds of stats, like distance covered, pace per mile (or interval), max heart rate, hours slept… We could go on.

But at the end of the day, there’s one measurement that stands out for having a huge influence on performance enhancement: your VO2 max.

All About VO2 Max and What It Means

“VO2 max is a measure of the amount of oxygen your body can use while running or the maximum rate at which we can race a middle- or long-distance race,” says Juli Benson, Olympian and owner of Juli Benson Training. It’s a number that denotes what volume of oxygen (in milliliters per kilogram of bodyweight per minute) that your body delivers during activity. Simply put, it’s a gauge of your aerobic capacity.

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Getting faster by way of VO2 max work is all about efficiency. “The higher your VO2 max, the faster or more efficiently you’ll be able to finish a race or training run—as your body moves the oxygen in the most effective manner,” says April Gatlin, ACE-certified personal trainer, master trainer, and coach for STRIDE Fitness.

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