Adapting your fitness routine as you age is the key to holding onto your strength, stability, bone density and energy levels. But listening to your body, hormone shifts, sleep needs and other niggles, is crucial.
Here, personal trainers, movements specialists, and sports dietitians, share why it’s essential to tune out of the noise of fads and focus on basic principles, such as mobility, resistance training, and functional fitness at any age.
They explain how certain nuances and life-related circumstances can impact your fitness routine in each decade, and how to overcome them.
In your 20s: overtraining
“The most common mistake I see with my clients in their twenties is treating fitness as a performance, rather than a practice,” says Louisa Drake, personal trainer, Pilates specialist and founder of The Louisa Drake Method (LDM). “This generation is more health-conscious than any before — they’re moving more, drinking less and treating wellness as part of their identity — which is positive. But that awareness comes with its own trap — [social media] serves up intense workouts, trending methods, and transformations. The message is often ‘more is always more.’”
Sports dietitian and author Renee McGregor, who specialises in athlete nutrition and hormonal health is also concerned by “the normalisation of overtraining”. It’s something she sees in the running community, of which she is part. “In the last few years I’ve seen more 20- or 30-something, particularly women, coming into my clinic who have quite severe stress fractures as a result of not recovering properly. It has become relatively normal to run marathons, and even ultra marathons, whether or not you have a solid history of running.
“Building up to races used to be much more progressive, spanning many years,” she says. For some people, constant participation in competitive events can mask a cycle of overtraining, under recovery, and not fuelling sufficiently beneath the surface, she says.
Personal trainer Ollie Thompson agrees that he sees more emphasis than he would like on extremes. “Working up a sweat and burning maximum calories is often prioritised over refining technique and learning [to] move well,” he says. “Yes, your twenties are your biological prime — the muscle, bone, and movement you build in this decade is like paying into a pension, the earlier and more consistently you invest, the more return you get later. At this age you recover and adapt quickly and can push your limits with less fear of injury, but gradually increasing load and effort are the fundamentals of building a real strength reserve.”
Some also get caught up in “optimisation culture”, obsessing over the perfect workout split, ideal rep range, or “best” exercise, he adds. “And when someone believes they must train five times per week or it’s not worth doing, they’re more likely to fall off entirely.”
Your 30s: Exercising to be small, not strong – or becoming sedentary
“Many of my clients in their thirties still exercise with one goal in mind: to be smaller,” Drake says. “They’ll gravitate toward Pilates and avoid anything weighted, carrying the deeply ingrained myth that lifting will make them ‘bulk up’. It takes real time and trust to shift that mindset.”
Building muscle requires consistent, focused effort, she adds, and genetics and body type play far bigger roles than people realise. “So the idea of accidentally transforming into a bodybuilder through a couple of weekly strength sessions is simply not going to happen. Research consistently shows that women who engage with strength training report higher confidence, better metabolic health, and improved mood. The physique fear is understandable given decades of messaging, but it’s time to retire it.”
Another common mistake at this age, according to Thompson, is believing that a single workout can compensate for an otherwise sedentary lifestyle. “In your thirties, many are balancing career growth, commuting and young families, which often means long hours sitting at a desk. They might fit in a 45-minute gym session, run or class after work – which is great, but then spend the remaining 10-12 waking hours largely inactive.
Overall daily movement matters just as much as formal exercise. Metabolic health, joint stiffness and lower back issues can begin creeping in during your thirties, and they’re strongly influenced by how much we move across the whole day. Building in regular walking, standing breaks and general movement alongside structured training will make a big difference long-term, over relying on workouts alone.”
But the biggest mistake of all at this age? “De-prioritising yourself entirely,” according to Drake. “Fitness becomes the first thing dropped when life gets busy — always framed as selflessness, when it’s actually self-neglect. I see clients who haven’t moved consistently in two or three years because they simply haven’t carved out the time, due to the competing demands of career pressure and young children. Even two well-structured sessions a week at this age builds a physiological foundation that will matter enormously in the decades to come. Starting the strength habit in your thirties isn’t vanity. It’s an investment.”
Your 40s: Ignoring the hormonal shift
“Perimenopause can begin in the early forties, and yet the majority of my female clients in this decade come to me with no idea it’s happening — they just know their body ‘isn’t responding the way it used to,’” Drake observes. “Sleep is disrupted. Recovery takes longer. The midsection feels different. And many are still training exactly as they did at 32: high intensity, low rest, cutting calories when results stall.”
This is the wrong approach, Drake says. “Oestrogen plays a direct role in muscle maintenance and bone density, and as levels begin to fluctuate, the body needs more support — not more punishment. This is the time to fall in love with strength training, to prioritise protein intake, and to understand that rest is not laziness.”
She adds that she has lost some regular clients to GLP-1s recently, “including some who were already at a low or healthy BMI and didn’t need it medically. Some people have always seen exercise as a chore, and the appeal of a shortcut is understandable. But strength training, and careful nutrition, becomes even more important if you are using weight loss medication.”
Men also begin to lose testosterone gradually from around 40, making strength training non-negotiable at this age to protect muscle mass. Certain hormonal shifts and accumulated wear and tear can contribute to what starts to present as persistent niggles and tendon issues, Thompson says. “Training needs to become more intelligent rather than just harder. I encourage clients to build sessions around fundamental movement patterns – squats, lunges, hinges, pushes and pulls – with a strong emphasis on single-leg and single-arm work, rotating exercises, stability and moving through a full range of motion,” he says.
“The goal shifts from simply looking great to maintaining strength, joint integrity and movement for the decades ahead. In my experience, those who make that transition in their forties tend to stay far more resilient into their fifties and beyond.”
Recovery shouldn’t be an afterthought during this period, either. “Instead, it becomes a key part of the training plan,” according to Thompson. “Prioritising sleep, spacing out intense sessions and including lower-intensity work allows the body to adapt and stay resilient. At the same time, recovery only has value if there is meaningful stimulus to recover from, avoiding intensity accelerates muscle loss and declining fitness. The goal in your forties isn’t to train less, but to strike the right balance.”
Your 50s: Overlooking muscle and bone
“The two conditions I want every woman to know about are sarcopenia — age-related loss of muscle mass that begins as early as our mid-thirties — and osteoporosis,” Drake says. “Both are largely preventable and manageable with the right exercise, and yet both are consistently overlooked because they are invisible until they aren’t. I regularly meet clients in their fifties who have been doing cardio for decades, are proud of their consistency, and have genuinely no idea that their muscle mass has been quietly declining or that their bone density may already be compromised.”
Of course, cardio has its place. “I’m not dismissing it — but it is not enough on its own at this stage of life,” she adds. “Resistance training is the single most powerful tool we have against both conditions. Lower-impact doesn’t have to mean lower-intensity.”
For men, particularly, in their fifties and sixties, Drake says it’s crucial not to overlook the power of mobility. “I’ll often see this shift which arrives via injury or the realisation that the body they pushed hard in their thirties and forties is now asking for something else. Tennis players and golfers come in wanting to improve their game and find that addressing mobility, often Pilates, transforms not just their sport but their day-to-day life. They’re stunned by how much better they feel. The golf swing improves. The knee that’s been ‘an issue for years’ calms down. Moving with ease becomes the goal.”
However, Thompson stresses the importance of not “playing it too safe” when it comes to fitness in your fifties. “Many people stick to what feels comfortable like walking, light weights or the same classes each week, but without sufficient intensity, the body simply doesn’t get the signal to stimulate muscle or bone, both of which naturally decline more rapidly during this decade,” he says. “Tendons need progressive loading to stay strong, bones need heavier resistance and occasional impact, and the cardiovascular system benefits from a range of intensities, not just steady, gentle effort. Variety is essential.”
There’s a misconception that lifting heavy is unsafe at this age, so people default to light weights and higher reps. “I recommend incorporating strength training with meaningful load, some faster or more powerful movements where appropriate, rotational exercises, and cardio work at different intensities. Keep challenging your body.”
60s and beyond: Confusing slowing down with stopping
“The mistake I see most in this decade isn’t laziness — it’s resignation,” Drake says. “Clients arrive having quietly accepted that stiffness, balance issues, and reduced mobility are part of ageing, when much of it is a result of inactivity and the wrong kind of movement.”
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Falls are the leading cause of injury-related death in older adults, she notes “and balance is entirely trainable. I’d love to see ‘mobility’ become as mainstream a concept as steps or calories — because for this generation, it would be genuinely life-changing. Mobility work, balance training, and controlled strength work are not add-ons. They are the main event.”
Thompson shares this caution, adding: “A big mistake is to start thinking of yourself as ‘fragile’, driven by fear of injury, and treat minor aches and stiffness as a signal to stop exercising altogether, rather than work around. In reality, avoiding dynamic or challenging movement entirely can accelerate physical decline.”
Another he identifies among some older adults, is assuming that worsening energy, poor sleep, or joint stiffness are problems that can only be solved with medication. “Sometimes the focus shifts toward managing symptoms rather than addressing one of the root causes – loss of muscle, strength, and aerobic fitness. While medical care is essential when needed, exercise remains one of the most powerful tools we have to improve how the body and brain function at this age.”
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