How Much Exercise Per Week You Really Need: What the WHO Says

How much exercise do you really need each week? The World Health Organization (WHO) recommends that adults get 150 to 300 minutes of moderate-intensity physical activity per week. But the second half of the answer matters more: according to studies, even activity below this threshold is linked to better health than none at all, so you can start with a much smaller dose¹².

Key points

• WHO recommends that adults get 150 to 300 minutes of moderate-intensity activity per week, plus strength training on at least two days a week³.
• A large pooled study (Arem 2015) linked even activity below the recommended minimum to a lower risk of death than no activity¹.
• Moderate-intensity activity is anything that gets you breathing harder but still lets you say a few words⁴⁵.
• You can start with 9 minutes a day and work your way up to the WHO recommendation gradually.
• Studies show an association between exercise and health, not a direct cause.

WHO recommendation: 150 to 300 minutes of activity per week

According to the 2020 WHO guidelines, adults aged 18 to 64 should do at least 150 to 300 minutes of moderate-intensity aerobic activity per week³. The same benefit comes from 75 to 150 minutes of vigorous-intensity activity, or a combination of the two³. On top of that, WHO adds muscle-strengthening exercise for the major muscle groups on at least two days a week.

For comparison: 150 minutes a week is roughly 21 minutes a day. The upper limit, 300 minutes, is five hours a week. WHO also says that above this limit there may be additional health benefits³, and a pooled analysis of cohorts found no signs of harm even in people who did ten times the recommended minimum¹.

Here is how this maps onto the H7 bands: the first level that exceeds the recommended minimum is H3 (3 hours a week). The upper WHO limit corresponds to H5 (5 hours a week). The H7 goal, that is, an hour of activity a day, is above this range. And as you know, it is a goal, not an entry requirement.

Why even a little activity is better than nothing

The number 150 minutes sounds like a bar you either clear or you don't. The data, however, show more of a smooth continuum. WHO explicitly states in its guidelines that some activity is better than none³. The American document Piercy 2018 (Physical Activity Guidelines for Americans) carries a similar message: people who move the least gain the most even from a modest increase in activity⁶.

Specific numbers came from the Arem 2015 study, which pooled data from several cohorts and followed more than 660,000 adults¹. The authors found that people with activity below the recommended minimum had about a 20% lower risk of death than people with no activity¹. For those who did one to two times the minimum, it was about 31%¹. So the biggest difference appeared between "nothing" and "a little."

Precision matters here. This is an observational study, which shows an association, not a cause. We are not saying that exercise on its own guarantees anything. We are saying that people who move tend to fare better in studies, even at small doses.

What counts and how to spread your activity out

You can recognize moderate-intensity activity by your breathing: you get out of breath, you can still say a few words, but singing would be out of the question. Brisk walking, stairs, cycling, swimming, full-body dancing, or gardening when you really put your back into it all count. A stroll to the bakery does not. That is no sin, it just doesn't add up to the recommended minutes.

One long session, or a little every day?

The O'Donovan 2017 study followed people who reached the recommended weekly dose (at least 150 minutes of moderate or 75 minutes of vigorous activity) and packed it into one or two sessions a week (so-called weekend warriors)⁷. Their risk of death was lower compared with inactive people, similar to people who spread their activity out⁷⁸. So if life doesn't allow you to move every day, you don't have to give up.

For most people, though, it is more practical and easier to keep up a short bout of activity every day. Just pick the option that fits your week:

• a shorter dose every day, for example 20 minutes of brisk walking,
• four to five longer blocks of 30 to 40 minutes,
• two longer activities on the weekend if you can't fit anything in during the week.

Why start small

For many people, there is a huge gap between "I don't move at all" and "150 minutes a week." That is exactly why the American guidelines recommend starting with a small amount and gradually increasing the duration or intensity of activity⁶. It's not about performance, it's about sticking with it.

H7 is built on the same principle. The white band (H1) is one hour a week, roughly 9 minutes a day. You can manage that even in a hectic week, say on your way home from work or after dinner. Each next band adds another hour a week. You don't have to track pace or kilometers, you track the time you spent out of breath.

A small start has one practical advantage: you won't give up after three weeks because you overdid it right at the beginning. And even if you fail to stick to the plan one week, you start again from the level you are at.

How to start: steps in order

• 1. Find out where you are. Open the H7 web app (it's free) and see which band you're at today.
• 2. Pick an activity you don't hate. The catalog has over 60 activities, from brisk walking to swimming.
• 3. Do 9 minutes a day for a week. Nothing more. The goal of the first week is a habit, not fitness.
• 4. Add an hour a week once it starts to feel easy. Only then move up to the next band.
• 5. Add strength training. Once you're at roughly the H3 level, add two days of exercise for the muscle groups, as WHO recommends.

If you have a health limitation or a chronic condition, talk to your doctor about how intensely to start. You can find the sources for the studies mentioned in the article on the Koncept H7 page.

Summary: how much activity per week is enough

The WHO recommendation is 150 to 300 minutes a week, and it is good to know it as a reference point. But the real answer is: as much as you can manage today, and a little bit more next week. Every minute that gets you out of breath counts.