Sitting Less: What the Guidelines Say About Sedentary Time and How to Break It Up

Physical activity · By the Plain Measure editorial team · Published 2026-10-30

A woman walking alone along a wide, tree-lined path in a city park — Getting up and out of a chair, even briefly, counts. Photo by Biel Morro, CC0.

Physical activity guidelines are usually summed up by one number: 150 minutes a week. But the same guidelines contain a second, quieter message that applies to almost everyone, including people who exercise regularly: sit less. Long stretches in a chair, on the sofa or behind the wheel are treated as a health issue in their own right. This guide explains what public health bodies mean by sedentary time, why they do not give a limit in hours, and how to cut it down without turning your day upside down.

Sedentary is not the same as inactive

Two ideas are easy to confuse. Being physically inactive means not reaching the recommended amount of moderate or vigorous activity. Being sedentary describes how much of your waking day you spend sitting or lying down with little movement. The World Health Organization defines sedentary behaviour as any period of low energy expenditure while awake, such as sitting, reclining or lying.

The two can coexist. Someone who runs for 45 minutes before work, then sits at a desk, in the car and on the sofa for the rest of the day, is active by the guidelines and highly sedentary at the same time. Someone else may never exercise formally but spend the day on their feet, walking between tasks. That is why the guidelines treat the two separately, and why meeting the weekly activity targets is only half the picture.

Sleep is not sedentary behaviour. The definition covers waking hours only.

What the guidelines say

The wording differs slightly between countries, but the direction is the same:

World Health Organization (2020): adults and older adults should limit the amount of time spent being sedentary. Replacing sedentary time with physical activity of any intensity, including light intensity, provides health benefits. To help reduce the harmful effects of high levels of sedentary behaviour, adults should aim to do more than the recommended minimum of moderate to vigorous activity.
UK Chief Medical Officers (2019): adults should aim to minimise the amount of time spent being sedentary and, when physically possible, break up long periods of inactivity with at least light physical activity.
US Physical Activity Guidelines (2018), used by the CDC: adults should move more and sit less throughout the day, and some physical activity is better than none.

The WHO links higher amounts of sedentary behaviour in adults with higher all-cause, cardiovascular and cancer mortality. The NHS lists heart disease, stroke, type 2 diabetes, weight gain and obesity among the problems associated with sitting or lying down for long periods.

Why there is no limit in hours

People often ask how many hours of sitting are too many. None of these bodies gives a figure. The research linking sitting with poorer health is mostly observational, which means it follows large groups of people over time and compares outcomes. It shows a consistent pattern, but it cannot pin down a precise safe threshold that would apply to everyone, and sitting time is hard to measure accurately from questionnaires. Instead of an arbitrary number, the guidelines give a direction of travel: less sitting than now, and fewer long unbroken stretches.

The research also suggests that more activity can offset part of the risk. A large analysis of studies published in The Lancet in 2016 (Ekelund and colleagues) found that among people who sat for many hours a day, those who did high amounts of moderate activity, around 60 to 75 minutes a day, did not have the higher risk of death seen in people who sat a lot and moved little. That is well above the minimum guideline, which is exactly why the WHO encourages very sedentary adults to aim beyond it.

Who sits the most

Desk jobs, long commutes by car and evenings in front of screens add up quickly for working-age adults. But according to the NHS, adults over 65 are the most sedentary age group, often spending 10 hours or more a day sitting or lying down. For older adults, breaking up sitting has an extra benefit: regular standing and walking help maintain the leg strength and balance that protect against falls. Our guide to muscle-strengthening activity explains why strength matters more, not less, with age.

Breaking up sitting at work

Small changes repeated many times a day are the realistic route for most people with desk jobs:

Use natural breaks. Stand up when the phone rings, when a video call is audio-only, or while you read a printed document.
Put things out of reach. A water bottle filled at a tap down the corridor, a printer in another room or a bin away from the desk all create reasons to get up.
Walk to talk. Go and see a colleague rather than sending a message, and suggest walking meetings for one-to-one conversations.
Take lunch away from the desk, ideally with a short walk outside.
Consider a sit-stand desk if one is available. Reviews of workplace studies suggest they can reduce sitting time at work, though the evidence is of limited quality, and standing still for hours is not the same as moving. Alternating, and walking when you can, matters more than standing for its own sake.

Breaking up sitting at home and on the move

Screens: get up during advert breaks or between episodes, and avoid automatically starting the next one.
Chores: household tasks such as tidying, cooking, gardening or hanging out washing are light activity, and they replace sitting time.
Short journeys: walk or cycle instead of driving where you can, or park further away. A brisk walk also counts towards your weekly minutes; see our guide to walking for health.
Public transport: stand for part of the journey if it is safe and you are able to.
Family time: swap one sofa evening a week for a walk, a game outdoors or a trip to a park.

If you have a long-term condition, a disability or limited mobility, the same principle applies on your own terms: any movement that interrupts long periods of sitting, such as changing position, upper-body exercises in a chair or a short walk with support, is better than none. A doctor or physiotherapist can suggest what is safe for you.

Making it stick

Sitting is a habit tied to places and routines: the desk, the commute, the evening sofa. Changing it works best by attaching new behaviour to those same cues rather than relying on willpower. Pick one or two situations where you sit for the longest unbroken stretches and plan a specific change for each, for example "stand for every phone call" or "walk for ten minutes after lunch". A gentle reminder on a phone or watch can help at first, until getting up becomes automatic.

Sitting less will not on its own change your weight dramatically, and it is not a substitute for the aerobic and strength activity in the guidelines. It is better seen as the base layer of an active life: the movement that fills the hours between workouts and makes the rest easier.

This page is general information from public health sources, not personal medical advice. If you have a health condition or have been inactive for a long time, talk to a doctor before making large changes to your activity.

Sources

World Health Organization, "Physical activity" fact sheet, and "WHO guidelines on physical activity and sedentary behaviour" (2020).
NHS, "Why we should sit less".
UK Chief Medical Officers' Physical Activity Guidelines (2019), Department of Health and Social Care.
US Department of Health and Human Services, "Physical Activity Guidelines for Americans", 2nd edition (2018).
Ekelund U et al. Does physical activity attenuate, or even eliminate, the detrimental association of sitting time with mortality? A harmonised meta-analysis of data from more than 1 million men and women. Lancet 2016;388(10051):1302–1310.
Shrestha N et al. Workplace interventions for reducing sitting at work. Cochrane Database of Systematic Reviews 2018.