Across British gyms, a quiet revolution is underway: younger adults are trading the treadmill for the barbell, drawn not only by the promise of stronger bodies but by the deeper human need for community, measurable progress, and a sense of belonging. Where previous generations sought fitness through solitary endurance, Gen Z is finding it through resistance — both physical and social. The shift, amplified by social media and supported by growing scientific evidence, reflects a broader renegotiation of how people invest in themselves and connect with others in an increasingly fragmented world.
Gen Z ditches treadmills for weights as strength training reshapes UK fitness culture
I want to go into my 30s being strong.
Mark
So the story is that Gen Z has stopped running on treadmills and started lifting weights instead. Is that actually what's happening?
Mimi
Not quite. Running is still the most common form of exercise for young people. What's changed is that strength training has become much more popular alongside running, and it's attracting people who might have done only cardio before.
Luke
How do we know that? The piece cites Sport England data showing more young adults using gyms and weights compared to nine years ago, but it doesn't give us the actual numbers or percentages. We're told it's a shift, but we don't know the magnitude.
Mimi
Fair point. The data exists but isn't quantified in the reporting. What we do know is that gym membership spending has jumped dramatically—a quarter of 16-34 year olds now rank it as a top priority, up from a fifth in 2024.
Mark
Why the shift? Is it just that strength training works better?
Mimi
It's multiple things. The research shows strength training does improve body composition faster than cardio. But social media influencers are also showing people it's achievable. And there's a social element—gyms are less isolating than running alone on a treadmill.
Luke
The social media influence claim comes from one expert's observation, not from data about how many people actually learned from influencers or changed their behavior because of them. It's plausible, but it's one person's interpretation.
Mark
What about the cost? Is this accessible to everyone?
Mimi
That's a real question the piece raises but doesn't fully answer. A third of Gen Z spends £26-50 monthly, a quarter spends over £50. That's significant money, especially for people on tight budgets.
Luke
And we don't know what percentage of Gen Z can't afford it at all, or what the barriers are for people not in gyms. The piece focuses on people who are already exercising.
Mark
So what's actually driving this?
Mimi
Accessibility, community, and measurable progress. Cordelia Sheridan can walk to her gym in five minutes. She can see herself lifting heavier weights. And she's doing it with other people.
Luke
Which matters because it's sustainable. Dr Al-Zubaidi's point is that exercise sticks when it's fun and social, not when it's framed as disease prevention.
Mark
Is this a permanent shift or a trend?
Mimi
The piece doesn't speculate on that. It documents what's happening now and notes that the ecosystem supporting fitness—apps, clubs, wearable tech—is expanding. Whether strength training remains dominant or whether people cycle back to other forms of exercise is still unknown.
The Pulse
- The treadmill's reign is ending — younger gym-goers are abandoning cardio machines in favour of barbells, kettlebells, and cable machines that deliver visible results faster.
- Social media is accelerating the shift, with influencers making strength training feel attainable and turning personal transformation into a shareable, communal story.
- Gym membership has become a financial non-negotiable for over a quarter of 16-34 year olds, now ranked above holidays and dining out as a top spending priority.
- The health case has hardened: two hours of weekly strength training rivals aerobic exercise in protecting the heart, brain, and mental wellbeing — giving the trend scientific credibility.
- Running and community events like Parkrun continue to grow in parallel, suggesting Britain is not abandoning one form of movement but expanding its relationship with all of them.
- The gym boom is landing not just as a fitness trend but as a social infrastructure — a place to belong, to be challenged, and to do something hard alongside others.
Across British gyms, a quiet revolution is underway: younger adults are trading the treadmill for the barbell, drawn not only by the promise of stronger bodies but by the deeper human need for community, measurable progress, and a sense of belonging. Where previous generations sought fitness through solitary endurance, Gen Z is finding it through resistance — both physical and social. The shift, amplified by social media and supported by growing scientific evidence, reflects a broader renegotiation of how people invest in themselves and connect with others in an increasingly fragmented world.
Antonia Duffin was 34 when she first walked into a gym hoping to lose weight. That personal goal eventually became a career: she trained as a personal trainer while working in supermarket operations, and later opened her own women's gym in Manchester, built inside a shipping container. Her clients come with varied motivations — some want to feel stronger, others are preparing for pregnancy, others are managing chronic conditions. What surprised her most was where they all ended up: not on the treadmill, but lifting weights.
The shift is generational and measurable. Sport England data confirms that more young adults are using weights and resistance equipment than they were nine years ago. Will Seward, 19, began lifting at secondary school with simple goals — get stronger, build his physique — and has since moved from cardio machines to explosive weight training. "It's had a real impact on my day to day life," he says, "improving my mood and making me feel generally healthier." Exercise experts point to a clear physiological reason for the trend's appeal: resistance training reshapes body composition more quickly than aerobic work, and social media influencers have made that visible and aspirational.
The science has caught up too. Research now suggests that two hours of strength training per week delivers many of the same protective benefits as regular cardio — lower cardiovascular risk, brain health, improved self-esteem. Yet running has not been displaced. Parkrun, free and community-organised, is growing across all age groups, and running remains the most common form of physical activity for young adults. The story is not one of replacement, but of expansion.
What has shifted most sharply is how young people spend. More than a quarter of 16-34 year olds now rank gym costs as a top financial priority — up from one fifth in 2024. Cordelia Sheridan, 27, pays £45 a month for her gym membership and treats it like a utility bill. She arrives at 6:30am, five days a week, and has moved from a cardio-heavy routine to targeted weight training. The change was driven by frustration with stalled progress — now she measures improvement in kilograms lifted and goals met. "I want to go into my 30s being strong," she says. What she didn't anticipate: "It's also weirdly more sociable."
That social dimension may be the most important driver of all. A GP and personal trainer describes an "enormous ecosystem" of gyms, apps, running clubs, and wearables that works precisely because it makes exercise enjoyable and communal — not because it prevents disease. As remote work reshapes daily life, particularly for younger people, the gym has become more than a place to train. It is a place to belong.
Antonia Duffin was 34 when she first walked into a gym wanting to lose weight and tone up. What started as a personal fitness goal became a career. She qualified as a personal trainer while working in operations at a supermarket chain, and eventually opened her own women's gym in Manchester, housed in a shipping container. Her clients arrive with different reasons: some want to feel stronger, others are preparing for pregnancy, still others are managing conditions like endometriosis and seeking relief through movement. What struck her most was a shift in what people actually wanted to do once they got there.
The treadmill, it seems, is no longer the centerpiece of the British gym. Hybrid training events like Hyrox—competitive, social, and varied—have begun to displace the solitary grind of cardio machines. Younger clients in particular are drawn to strength work: barbells, kettlebells, dumbbells, cable machines. Duffin sees this as a recognition of something that had been overlooked. "I think people are now realising the importance of it," she says. "We're preventing osteoporosis and things like that." The shift is not just anecdotal. Sport England data shows that more young adults are using gyms, exercise machines, and weights than they were nine years ago.
Will Seward, 19, exemplifies the pattern. He started lifting weights at secondary school with the straightforward goal of getting stronger and building his physique. His routine, usually three times a week, has evolved from running machines and exercise bikes to explosive weight training designed to build athleticism. "It's had a real impact on my day to day life," he says, "improving my mood and making me feel generally healthier." Dr Andrew Scott, an exercise expert from the University of Portsmouth, explains the appeal in physiological terms: resistance training improves body composition and shape more quickly than aerobic exercise. But there is another factor at work. Social media influencers are demonstrating that strength training is achievable, that ordinary people can do it, and that doing so produces visible results. The message spreads: I did this, so can you.
The health case for strength training has solidified. Recent research suggests that two hours of strength training per week—the recommended amount—delivers many of the same benefits as regular aerobic exercise: lower risk of dying from heart disease or stroke, protection for the brain, and a boost to self-esteem. Yet the numbers tell a more complex story about how Britain actually exercises. Running remains the single most common form of physical activity for young men and women, and it ranks in the top two for adults overall. Parkrun, the free, community-organised running events that happen every weekend at over 1,400 locations across the UK, is growing, with increasing participation from children, people in their 20s, and those over 50. The shift toward strength training is real, but it is not a wholesale abandonment of other forms of exercise.
What has changed most dramatically is how people prioritize fitness spending. More than a quarter of 16 to 34 year olds now rank gym membership and fitness costs as a top spending priority—ahead of holidays and eating out. That figure has jumped from one fifth in 2024. A 2026 survey by the Gym Group found that a third of Gen Z spent between £26 and £50 per month on health and fitness, with a quarter spending more than £50. Cordelia Sheridan, 27, an events manager in Battersea, treats her £45 monthly gym membership "like an essential utility bill." She exercises four to five times a week, arriving at 6:30am before work—her gym is a five-minute walk away. She spends ten minutes on a stair-climbing machine, then 35 minutes on weights and machines targeting her thighs, hips, and lower back. Her previous routine was cardio-focused, but she felt she was not making progress. Now she can measure improvement: she is lifting heavier weights, hitting targets, and feeling stronger. "I want to go into my 30s being strong," she says. And there is something else she did not expect. "It's also weirdly more sociable."
Dr Hussain Al-Zubaidi, a GP, personal trainer, and triathlete, describes an "enormous ecosystem" now surrounding fitness: gyms, running clubs, fitness apps, social media, wearable technology. The ecosystem works because it makes exercise social, accessible, and enjoyable—not primarily because it prevents disease. Prof Esther van Sluijs, a behavioural epidemiologist at Loughborough University, notes that as remote work becomes standard, particularly for younger people, having community clubs within easy reach of home has become crucial. The gym boom and the strength training shift are not simply about health outcomes, though those matter. They are about belonging, about having a place to go, about doing something hard alongside other people who are doing the same thing.
Notable Quotes
I think people are now realising the importance of it—we're preventing osteoporosis and things like that.— Antonia Duffin, personal trainer and gym owner
I think that's why activities like the gym, running clubs and padel have been successful—not because they prevent disease but because they are fun and sociable.— Dr Hussain Al-Zubaidi, GP and personal trainer
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