Strength training after 40: what the UK data actually shows
Strength declines considerably faster than muscle mass, and the age group with most to gain is the one least likely to be doing anything about it. The UK numbers on this are stark, and they are more useful than any motivational post.
Published 13 August 2026
There is a lot of noise written about training in midlife and very little of it cites anything. So here are the actual UK figures, what they mean, and what a reasonable response looks like.
The headline number
A cross-sectional study of 253,423 English adults, published in PLOS ONE in 2022, looked at how many people meet the UK’s muscle-strengthening guidelines. Applying the strictest definition aligned to the guidelines, the answer was 7.3% of men and 4.1% of women.
Not 40%. Not 20%. Roughly one in fourteen men and one in twenty-four women.
The same study found that adults aged 50 to 64 were 45% less likely to meet the strengthening guidelines than adults aged 19 to 34.
So the group whose strength is declining fastest is also the group least likely to be doing the one thing that addresses it. That is the whole problem in a sentence.
Why strength specifically, and not just “exercise”
The distinction matters. Muscle mass declines gradually with age. Muscle strength declines considerably faster than mass does: the two are not interchangeable, and tracking bodyweight or even body composition will not show you the thing that actually determines whether you can carry the shopping up two flights of stairs at seventy.
Cardio does many good things. It does not do this one. Strengthening activity is its own category in the UK Chief Medical Officers’ guidelines for a reason, and it is the category almost nobody is hitting.
The context number
Healthy life expectancy in England is now 60.9 years for men and 61.3 years for women, based on ONS data for 2022 to 2024. That is the average age at which people stop reporting themselves in “good” general health.
State pension age is currently 66, rising to 67 between 2026 and 2028.
Read those two together. On average, people in England reach the end of their healthy years roughly five years before they reach the age at which the state expects them to stop working. That gap is not a motivational metaphor. It is an arithmetic fact about the country.
What the behavioural research says about how to frame this
Here is the part that surprised us most, and it runs against how almost everyone markets fitness to people over forty.
A longitudinal study of 226 women aged 40 to 60 by Segar and colleagues compared how people framed their reasons for exercising. Those who framed it around quality of daily life did 34% more physical activity than those who framed it around weight, and 15% more than those who framed it around healthy ageing, despite all three groups rating their goals as equally important.
Healthy ageing was the most commonly held goal and the least acted on.
The practical translation: “so I can still do this in thirty years” is a weaker motivator than “so Tuesday is easier”. If you are trying to build a habit that survives February, tie it to something you will notice this week.
A reasonable response
Nothing here requires a gym membership or a personal trainer, though both help.
- Two sessions a week that work all the major muscle groups. That is the guideline. It is not a lot, and 92.7% of men are not doing it.
- Progressive load. The same weight forever produces the same result forever. Something has to increase: weight, reps, or difficulty.
- Track strength, not just weight. If the only number you watch is on the bathroom scales, you are watching the wrong one.
- Frame it around this week. Stairs, shopping, getting off the floor, playing with grandchildren. The evidence says that framing produces more actual training than the thirty-year one.
Sources
Sandercock, G. R. H., Moran, J., & Cohen, D. D. (2022). Who is meeting the strengthening physical activity guidelines by definition: A cross-sectional study of 253,423 English adults? PLOS ONE, 17(5), e0267277.
Office for National Statistics, Health state life expectancies, UK: between 2011 to 2013 and 2022 to 2024.
Segar, M., Eccles, J. S., & Richardson, C. R. (2011). Rebranding exercise: closing the gap between values and behavior.
This article is general information, not medical advice. If you have a health condition or take prescription medication, speak to your GP before starting a new training programme.
