How much exercise per week do you need? UK guidance from the four Chief Medical Officers recommends that adults do at least 150 minutes of moderate-intensity activity a week, or 75 minutes of vigorous activity, plus muscle-strengthening work on at least two days. You can spread it however suits you, and if you are starting from nothing, doing something is what matters most.
What do the UK exercise guidelines say?
The guidance, set by the UK's four Chief Medical Officers, has two main parts for adults aged 19 to 64. The first is aerobic activity: at least 150 minutes of moderate intensity a week, or 75 minutes of vigorous intensity, or a mix of the two. The second, often overlooked, is muscle-strengthening activity working the major muscle groups on at least two days a week. You can read the full NHS summary of the physical activity guidelines for the detail.
These figures are not arbitrary. They broadly match the World Health Organization's global recommendations, which draw on evidence that this amount of activity is associated with lower rates of heart disease, type 2 diabetes, several cancers, depression and early death. There is also a strong message to reduce time spent sitting and to break up long sedentary periods, which we cover in sitting time and health. Movement across the day counts, not just formal exercise sessions.
What counts as moderate and vigorous activity?
Moderate activity raises your heart rate and breathing so you feel warmer, but you can still talk. Brisk walking, cycling on the level, doubles tennis or heavy housework all qualify. Vigorous activity leaves you breathing hard and unable to say more than a few words: running, swimming lengths, football, or a spin class. Because vigorous work is more intense, it counts double, which is why 75 minutes of it maps onto 150 minutes of moderate.
Strength work is anything that makes your muscles work against resistance: lifting weights, resistance bands, bodyweight exercises like squats and press-ups, or carrying heavy shopping and gardening. It does not require a gym. Walking is a simple way to bank aerobic minutes, and how step counts fit this broader picture is discussed in daily steps evidence.
Why strength training gets neglected
Most people who exercise focus on the aerobic half and skip the strength half, yet muscle-strengthening work has distinct benefits that cardio does not fully cover: it maintains muscle and bone, supports metabolism, and helps preserve independence and balance as you age. From midlife onward this matters increasingly, because muscle is lost naturally with age unless it is actively maintained.
The recovery side is easy to forget too. Muscle adapts and gets stronger during the rest between sessions, not during the session itself, which is why training the same muscles hard on consecutive days is counterproductive; we explain this in rest days and recovery evidence. A structured approach to combining strength and fat loss is set out in strength training for fat loss.
How do I start from zero?
If you are currently inactive, the 150-minute figure can feel out of reach, and treating it as an all-or-nothing target is the quickest way to give up. The honest guidance is that the biggest health gains come from moving from doing nothing to doing something, so the starting point is far more forgiving than the headline suggests.
- Begin with short, manageable sessions: a ten-minute walk most days is a genuine start.
- Build gradually, adding a little time or intensity as it becomes comfortable.
- Choose activity you will actually repeat; the best exercise is the one you keep doing.
- Add simple strength work, such as sit-to-stands or wall press-ups, a couple of times a week.
- If you have a health condition or have been inactive for a long time, check with your GP before starting anything vigorous.
Does exercise help with weight loss?
Meeting the guidelines improves health regardless of what happens on the scales, and that is the main reason to do it. Activity does support weight management by raising the calories you burn and helping preserve muscle, but on its own it is a relatively weak lever for weight loss compared with diet, because it is easy to eat back the calories a workout uses. Exercise and eating patterns work together; the wider picture is covered in our weight loss information. The clearest message is to value activity for its broad health benefits first, and treat any weight effect as a bonus.
Do the guidelines change with age?
The core targets apply across adulthood, but the emphasis shifts. For adults aged 65 and over, the Chief Medical Officers add activities that improve balance and coordination, such as tai chi, bowls or dancing, on at least two days a week, because these help reduce the risk of falls. The aerobic and strength recommendations remain, adjusted to ability.
There is separate guidance for children and young people, who are advised to average 60 minutes of moderate to vigorous activity a day across the week. The through-line at every age is the same: any movement is better than none, and reducing long periods of sitting benefits everyone.
Keeping it realistic
The guidelines are a target to build towards, not a bar you must clear immediately. Consistency over months beats a burst of enthusiasm that fizzles out. Whatever you can sustain, done regularly, is worth more than an ideal plan you abandon in a fortnight.
