UK strength training guidelines: how much muscle-strengthening do adults need?

What do the UK guidelines say about strength training?

The UK Chief Medical Officers (CMOs) set one clear floor for adults aged 19 to 64: do activities that develop or maintain strength in the major muscle groups, on at least 2 days a week, and remember that any strengthening activity is better than none.¹ The examples they give are using bodyweight, free weights, resistance machines or elastic bands, plus everyday tasks such as stair climbing and lifting and carrying children.¹

For older adults (65 and over) the CMOs ask for activities aimed at improving or maintaining muscle strength, balance and flexibility on at least 2 days a week.¹ The NHS repeats this, and adds that adults aged 65 and over should also be active every day, even if only lightly.³

Notice what the guidelines do not say. They do not name a number of minutes for strength sessions, and they do not require a gym. The NHS says there are no specific recommendations for how much time you should spend on strength and flexibility exercises.⁴

Which muscles, and what counts as strengthening?

The NHS says to work all the major muscle groups: legs, hips, back, abdomen, chest, shoulders and arms.²⁴ For an activity to count as strengthening, it needs to work your muscles to the point where you may need a short rest before continuing.⁴ A simple test is lifting a weight: if you have to put it down after a number of lifts before carrying on, it counted.⁴

The NHS list of examples is wide. It includes lifting weights, working with resistance bands, heavy gardening such as digging and shovelling, climbing stairs, hill walking, cycling, dance, push-ups, sit-ups and squats, and yoga.⁴ Carrying heavy shopping bags, tai chi and pilates appear in its adult guidance.²

Activities for muscles and bones after 65

The NHS says that being inactive makes muscles and bones lose strength, which raises the risk of osteoporosis, falls and fractures.⁶ For strength after 65 it suggests lifting weights, dancing, carrying groceries, going up and down stairs, exercising to music, heavy gardening and yoga, at least twice a week.⁶ It names yoga and tai chi as best for balance and flexibility.⁶

A clear plan for avoiding falls is in a separate guide: see falls prevention for older adults.

Sets, repetitions and a worked example

The NHS gives the numbers for a session. Aim for 8 to 12 repetitions of each activity, which counts as 1 set. Try to do at least 2 sets, and 3 sets for more benefit.⁴ Start gradually and build up over a period of weeks.⁴ The effort level is described as the point at which another repetition would be difficult without help.⁴

Here is how that scales across a whole session. Suppose you choose one activity for each of the 7 muscle groups the NHS lists. At 2 sets of 8 to 12 repetitions each, that is 7 × 2 × 8 = 112 repetitions at the lower end and 7 × 2 × 12 = 168 at the upper end.²⁴ With 3 sets the range becomes 168 to 252. Most people will not cover every group in one visit, which is fine: the guideline counts days, not a perfect session.

The NHS also warns that time spent on strength exercises does not count towards the 150 minutes of moderate aerobic activity.⁴ Walking and cycling do count.⁴ Plan the two kinds of activity separately.

Starting safely

The CMOs say the evidence is clear that the benefits of physical activity outweigh the risks, and that starting at low durations and intensities and building up over time is the safest way to progress.¹ The NHS says to see a GP first if you have not exercised for some time, or if you have a medical condition or concerns, and to make sure the activity and its intensity suit your fitness.²³

1. Check with your GP if you need to. The NHS advises this if you have not exercised for a while or have a medical condition.²³
2. Choose a form you can control. Bodyweight, bands, free weights or a resistance machine all appear in the CMO examples.¹
3. Begin light. The NHS says to build up slowly and gradually increase repetitions over time.⁵ Its sample moves use light weights, and it says filled water bottles will do.⁵
4. Do each move slowly. In the NHS sit-to-stand, the slower the repetitions, the better.⁵
5. Work towards 2 days a week. That is the minimum in the CMO and NHS guidelines.¹³
6. Add repetitions or sets over weeks. Move towards 8 to 12 repetitions and 2 to 3 sets, as the NHS describes.⁴

If you have frailty, moderate-to-severe dementia, a history of vertebral fractures or regular falls, the CMOs say it might be more appropriate for new exercises to be supervised at first by a trained professional.¹ The NHS adds, for people with osteoporosis, that you may need to be cautious about some high-impact exercise and your GP can advise you.⁶

Home strength moves from the NHS

The NHS strength exercises page offers simple moves at home, and recommends doing them at least twice a week.⁵ For the chair-based moves it says to use a solid, stable chair without wheels that will not slip.⁵

Notice the pattern. These moves start at 5 repetitions, not 12. If you do the leg extension at its full amount, that is 5 holds × up to 5 seconds on each of 2 legs, so up to 50 seconds under tension in total.⁵ Small numbers, repeated twice a week, are the guideline in action.

Using a wall-mounted cable machine for strength work

Resistance machines are one of the CMO examples of strengthening activity.¹ A wall-mounted cable machine is a form of resistance equipment you can keep at home. The guidelines are about the activity, not the kit, so the same 2-day minimum and the same 8 to 12 repetitions apply whichever form you choose.¹⁴

What a cable machine adds is the ability to change the load in small steps. That suits the NHS advice to start light and build up over weeks.⁴ If you are comparing options, ask four questions: can I set a load low enough to begin, can I raise it gradually, is the cable path smooth enough to control, and is there a wall that can carry it?

Model I is Chutex fitness equipment. It is not a medical device and not a therapy, and it is not a substitute for advice from your GP or a physiotherapist.

How does strength training fit with the rest of your week?

The guidelines are a pair: strength on at least 2 days, and aerobic activity of at least 150 minutes of moderate intensity or 75 minutes of vigorous intensity each week.¹ The NHS says moderate means you can talk but not sing, and vigorous means you can say only a few words without pausing for breath.²

The CMOs also say adults should minimise sedentary time and break up long periods of inactivity with at least light activity.¹ The NHS says the same of older adults: reduce time spent sitting or lying down.³

Body measurements can help you see whether a plan suits you. Two related guides are waist measurement and BMI and a healthy weight. If you sit for long periods, see back pain from sitting.

Frequently asked questions