The evidence-led answer
NST verdict
For health, the standard target is 150 to 300 minutes of moderate cardio a week, or 75 to 150 minutes of vigorous, or a mix, plus strength training on two or more days. The lower end is roughly 20 to 30 minutes on most days of something that gets your breathing up. But the single biggest return comes from the first slice: in large studies that tracked activity with wearable devices, moving from almost nothing to a modest amount roughly halved the risk of dying over the follow up, and the curve flattens after that. More brings more benefit up to a point, then plateaus. It does not have to be a "workout": brisk walking, cycling to work, stairs and vigorous chores all count, and a minute of vigorous activity is worth about three of moderate. If your goal is fitness or performance rather than health, you will want more than this and more structure. If your goal is health and living longer, hitting the low end consistently is what matters. If you have a heart condition or have been very inactive, get medical advice before ramping up vigorous exercise.
What is the actual number?
The most widely used answer is the World Health Organization's 2020 guidance for adults: 150 to 300 minutes a week of moderate aerobic activity, or 75 to 150 minutes of vigorous activity, or an equivalent combination of the two, plus muscle strengthening activity on 2 or more days a week. Moderate means your breathing is noticeably up but you could still hold a conversation; vigorous means you can only manage a few words at a time. So 150 minutes is about 20 to 30 minutes on most days. The guidance also says plainly that some activity is better than none, that more is better for health up to a point, and that cutting down long stretches of sitting matters in its own right. These are pragmatic public health ranges drawn from observational studies, not an exact biological line.
Do you get most of the benefit from a little?
Yes, and this is the part worth internalising. A pooled analysis of eight studies tracking about 36,000 middle aged and older adults with wearable activity monitors found a curved dose response for death from any cause. Compared with the least active quarter of people, the next quarter up had roughly half the mortality risk. Moving further up the activity scale kept helping, but by smaller and smaller amounts. Light activity counted too, not just huffing and puffing exercise. A 2025 analysis of UK adults who did no formal exercise found the same shape for heart disease: everyday moderate and vigorous movement lowered risk in a dose response way and then levelled off, at around 14 minutes a day of vigorous activity, or 34 to 50 minutes a day of moderate. In other words, the steepest part of the benefit curve is right at the start, when a mostly inactive person starts moving a bit more.
Does it have to be a cardio workout?
No. In that 2025 analysis, the activity being measured was "incidental", stairs instead of the lift, a brisk walk to the shop, carrying bags, vigorous housework, not gym sessions, and it still tracked with lower cardiovascular risk. The same study estimated that one minute of vigorous activity was associated with about the same benefit as three minutes of moderate activity, so short bursts of harder effort are an efficient way to accumulate the total. Structured cardio, a run, a class, a bike ride, is a convenient way to bank a big chunk at once, but it is the weekly total of breathing harder time that the health evidence is about, however you assemble it.
What about strength training, and is more always better?
Muscle strengthening activity has its own separate link to living longer. A pooled analysis of 10 studies found that doing any resistance training was associated with about 15 percent lower risk of death from any cause, with the biggest reduction at roughly 60 minutes a week and the benefit appearing to tail off at higher volumes, though only four studies fed that estimate, so the ceiling is uncertain. That mirrors the aerobic picture: benefit rises steeply, then flattens. This does not mean high training volumes harm most people. It means that for the specific goal of health and longevity, meeting the guideline captures the large majority of the benefit, and piling on far more cardio is chasing a much smaller return. Training for endurance, a race, or sport is a different goal with a different answer: there you do need more, and more structured, work.
What this means in practice
Aim for 150 minutes a week of activity that raises your breathing as a floor, and up to about 300 if it fits your life; add two short strength sessions. Count everything, the walk to the station, the stairs, the weekend hike, the five a side game. If you are starting from very little, the most valuable thing you can do is the first 10 to 20 minutes a day; do not let the full target put you off starting small. Use harder, shorter efforts when time is tight, since a minute of vigorous roughly equals three of moderate. Break up long sitting stretches. And judge "enough" by your goal: for general health, consistent moderate amounts are plenty; for fitness or performance, expect to train more and more deliberately. If you have a heart or lung condition, or have been very inactive, check with a doctor before starting vigorous exercise.
Practical meaning
Aim for 150 minutes a week of breathing harder activity as a floor, up to about 300 if it fits, plus two short strength sessions. Count everything, walking, stairs, hikes, a kickabout. If you do very little now, the first 10 to 20 minutes a day is the highest value change; do not let the full target stop you starting small. Use shorter harder efforts when time is short (a minute of vigorous roughly equals three of moderate) and break up long sitting. Judge 'enough' by your goal: consistent moderate amounts for general health; more and more structured training for fitness or performance. With a heart or lung condition, or after a long inactive spell, check with a doctor before vigorous exercise.
Limitations and uncertainty
The 150 to 300 minute target is a public health guideline built largely on observational evidence, not a precise biological threshold. The dose response and mortality findings come from prospective cohort studies, which cannot prove cause and effect and are open to residual confounding and reverse causation (early illness reducing activity); the accelerometer cohorts were middle aged and older and skewed female, and one large analysis was UK only non exercisers. The 'benefit plateaus' and 'one minute vigorous equals three minutes moderate' figures are model estimates, not trial results. The resistance training dose response, including the apparent tail off at high volumes, rested on only four studies with self reported training. All of this is about health and longevity endpoints; fitness, endurance and sport performance need more, and more structured, training and are outside the scope here.
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