What Is VO2max, and How Do You Raise It?
Your aerobic ceiling — what sets it, and the training that lifts it.
VO2max is the most oxygen your body can take in and use during hard exercise. It’s a useful shorthand for aerobic fitness: a higher ceiling means more power available before you’re gasping. You can’t train it directly, but you can train the systems that set it — and most runners have more room to improve than they think.
What the number measures
Picture a pipeline that moves oxygen from the air to your muscles. VO2max is how much that whole pipeline can deliver and burn at full tilt, usually given relative to body weight (millilitres of oxygen per kilogram per minute).
- It reflects your aerobic engine, not your race time directly — pacing, efficiency, and endurance still decide the result.
- It’s most relevant to hard efforts from roughly three to thirty minutes, where aerobic power is the limiter.
- Two runners with the same VO2max can race differently depending on how economical they are.
What sets the ceiling
The limit is mostly about delivery rather than the muscle’s appetite for oxygen. The heart and blood do the heavy lifting, and the muscle’s machinery fills in the rest.
- Central side: how much blood your heart pumps each beat (stroke volume) and your total blood volume. Reviews point to expanded blood volume and stroke volume as the main drivers of training gains (Lundby et al., 2017).
- Peripheral side: capillaries feeding the muscle and the mitochondria that actually use the oxygen.
- Training nudges all of these, which is why both how hard and how much you run matter.
The training that moves it
Two ingredients raise VO2max, and they work best together rather than in isolation.
- Intervals near your hardest sustainable effort — think repeats of two to five minutes at roughly 3K–5K effort, with easy recovery. A meta-analysis found this kind of high-intensity work reliably lifts VO2max, including in already-trained athletes (2023).
- A base of easy aerobic volume that grows the heart, blood, and capillary network the intervals draw on.
- Consistency over months beats any single brutal session; the adaptations are slow and cumulative.
How much can you actually gain?
Improvement is real but bounded, and it’s faster when you start out unfit.
- Beginners often see the biggest jumps; trained runners gain more slowly and lean harder on consistency.
- People who seem not to respond to a given dose usually do respond once the training volume goes up (Montero & Lundby, 2017).
- Genetics set the range, but very few runners are anywhere near their own ceiling.
Where Stride fits in
- Plans pair the right dose of interval work with the easy mileage that supports it, instead of piling on hard sessions.
- Paces come from your own fitness, so VO2max-style intervals target an effort you can actually hold and repeat.
- You can sanity-check your current fitness with the pace calculator and race predictor in the tools section.
References
- Lundby, C., Montero, D. & Joyner, M. "Biology of VO2max: looking under the physiology lamp." Acta Physiologica, 2017.
- Wen, D. et al. "VO2max (VO2peak) in elite athletes under high-intensity interval training: A meta-analysis." Heliyon, 2023.
- Montero, D. & Lundby, C. "Refuting the myth of non-response to exercise training." The Journal of Physiology, 2017.
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