VO2max and longevity: what the research says about fitness and living longer
Large studies link cardiorespiratory fitness to lower risk of death, with no upper limit of benefit. What they found and what it means for you.
The VO2max Health Blog
Breathe deeper. Live longer.
VO2max, research, health and sport — linked together. Free for everyone, written from the research, with sources at the end of every article.
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All 2026 trends →The health trends people are searching for, checked against the research.
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7,000 vs 10,000 steps a day: what the research says
Is 10,000 steps a day necessary? Large meta-analyses link about 7,000 steps to much lower risk of death. What that means and how steps relate to VO2max.
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Cold plunges: recovery help or gains killer?
Cold plunges ease muscle soreness but regular use after lifting can blunt strength and muscle gains. What the research says and when an ice bath makes sense.
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Exercise snacks: 1-minute bursts and your fitness
Exercise snacks and VILPA, the 1-minute bursts of vigorous daily activity, are linked to lower mortality. What the studies show and how to fit them in.
VO2max by sport
Sports hub →VO2max
All VO2max articles →What VO2max is, how it is measured and what moves it.
Apple Watch VO2max: accuracy, levels and how to raise it
Apple Watch shows your VO2max as Cardio Fitness. Where to find it, what the four levels mean, how accurate it is and why it can read low.
Cardio fitness score explained: Fitbit, Oura, WHOOP and more
Cardio fitness score is a wearable's VO2max estimate. How Fitbit, Oura, WHOOP, Apple, Garmin and Polar calculate and label it, plus scores by age.
Garmin VO2max explained: colours, accuracy, fitness age
What your Garmin VO2max number and colour mean, where to find it, how accurate it is, why it drops and how fitness age is worked out.
Research
All Research articles →What the studies actually say — fitness, longevity, trainability.
Trending
Cold plunges: recovery help or gains killer?
Cold plunges ease muscle soreness but regular use after lifting can blunt strength and muscle gains. What the research says and when an ice bath makes sense.
Do supplements raise VO2max? Caffeine, beetroot and iron
Caffeine and beetroot juice can boost endurance, but they don't raise VO2max. What the evidence shows, doses, and why iron needs a blood test first.
Fit but fat? Fitness vs fatness and mortality
Is it better to be fit and overweight than thin and unfit? What the fitness-vs-fatness research shows, where it falls short, and what it means for you.
Health
All Health articles →Cardiorespiratory fitness as a health marker: ageing, recovery, lifestyle.
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7,000 vs 10,000 steps a day: what the research says
Is 10,000 steps a day necessary? Large meta-analyses link about 7,000 steps to much lower risk of death. What that means and how steps relate to VO2max.
Blood tests for athletes: which markers really matter
Which blood tests matter for endurance athletes, from ferritin and haemoglobin to vitamin D and thyroid, plus sports anaemia, timing and how often to test.
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Exercise snacks: 1-minute bursts and your fitness
Exercise snacks and VILPA, the 1-minute bursts of vigorous daily activity, are linked to lower mortality. What the studies show and how to fit them in.
Sports & training
All Sports & training articles →Training methods that raise VO2max, and how it plays out in each sport.
3 zone vs 5 zone training: heart rate, power and pace
3-zone vs 5-zone training models, heart rate vs power vs pace zones, and why cardiac drift makes your heart rate climb on easy runs at the same pace.
HIIT vs steady cardio: which raises VO2max more?
HIIT or moderate continuous training? What meta-analyses say about VO2max and health, how low-volume HIIT compares, and how to combine both in a week.
How much training to improve VO2max? Volume vs intensity
How much weekly training it takes to raise VO2max, what dose-response studies show, how volume and intensity trade off, and sensible km per week by level.