If the workouts that kept you lean and energised in your 30s have suddenly stopped working, you're not imagining it. For many women in their 40s, perimenopause is part of the reason: the transition leading up to menopause, which can last several years, when shifting hormones can change how your body responds to training.
The good news? With the right approach, this can be one of the strongest, most empowered chapters of your life. The wrong approach — usually more cardio, less food and more "discipline" — tends to leave women exhausted and frustrated, despite doing everything they used to do.
This guide breaks down what tends to change in perimenopause, why generic gym programmes so often fall short for women at this stage, and how a smarter training strategy can help you build strength, look after your bones and feel like yourself again. It's written from the floor of our private studio in Blackheath, where perimenopause training is one of our core programmes. We're coaches, not clinicians: for symptoms and treatment, your GP comes first.
What's really happening in perimenopause
Perimenopause most often begins in a woman's 40s, though it can start earlier. During this time your ovaries gradually produce less oestrogen and progesterone — but the decline isn't smooth. It's erratic, with rises and dips that are behind many of the symptoms women experience. If you're under 45 and your periods have changed, or you're not sure what is behind your symptoms, your GP is the right first stop.
Here's what those hormonal shifts can mean for your body and your training:
- Muscle tends to become harder to keep. Falling oestrogen is thought to play a part, and without strength training muscle can be lost more quickly.
- Bone density tends to fall. Bone loss can speed up in the years around menopause, which raises the risk of osteoporosis later in life.
- Body composition can change. Fat tends to shift towards the middle, sometimes even when the number on the scales stays the same.
- Recovery can slow down. A workout you bounced back from in a day in your early 30s can take noticeably longer in your mid-40s.
- Sleep, mood and energy fluctuate. Stress can feel harder to shake off, which affects everything from recovery to motivation.
None of this is a problem to solve with willpower. It's a physical shift that calls for a different kind of training — and strength work sits at the centre of it.
Why most gym programmes fail women in perimenopause
Walk into most gyms and you'll see women in their 40s doing exactly what worked for them in their 30s — only harder. More spin classes. Longer runs. Fewer calories. Endless HIIT circuits.
This approach tends to work against you at this stage. Piling long, hard cardio on top of a stressful week and poor sleep can leave you more drained than energised, and it does little to build the muscle you are trying to keep. Under-eating makes holding on to that muscle harder still. And group classes designed for the general population rarely address the needs of a woman whose joints are stiffer, whose recovery is slower and whose hormones are no longer doing the heavy lifting in the background.
What this stage needs is precision. Not more effort — better effort.
The four pillars of effective perimenopause training
1. Heavy strength training
This is the foundation. Lifting loads that genuinely challenge you, built up gradually and with coached technique, is one of the most useful things you can do in perimenopause. It builds the muscle that supports your metabolism and gives your bones the kind of loading that helps keep them strong. Very light weights that never get harder won't do the same job.
2. Short sprint intervals, in small doses
Short, hard efforts — 10 to 30 seconds on the assault bike or rower, with full recovery in between — train your heart and lungs in a few minutes, without the fatigue that long cardio sessions can pile on. They're scaled to your fitness and added only once the basics are in place, and in our programmes a couple of short sessions a week is usually enough. Walking and other easy cardio still earn their place, and if you have a heart condition, high blood pressure or haven't trained hard in years, check with your GP before any all-out efforts.
3. Mobility and joint care
Joints and connective tissue often feel stiffer as oestrogen drops. Dedicated mobility work isn't an optional extra — it helps keep you moving comfortably as the loads go up. That means proper warm-ups, controlled range-of-motion work, and never skipping the parts that feel boring.
4. Recovery as a training variable
In your 20s you could out-train bad recovery. In perimenopause, recovery is the work. Sleep, enough protein, stress management and rest days aren't extras — they're what make the training effective. For our clients, the full nutrition plan Karolina writes covers the food side.
Why private training makes the difference
Generic programmes are written for the average gym-goer. They don't account for how you slept last night, whether you're dealing with hot flushes or joint pain, or a week where stress is through the roof.
Good training at this stage looks different. It takes a coach who understands what perimenopause does to training, not just sets and reps; programming that adapts to how your body shows up on the day; technique coaching that looks after your joints as the loads increase; and a space where you're not the only woman over 40 surrounded by 22-year-olds.
That is exactly what our perimenopause programme here in Blackheath is built around: every session one-to-one, every programme written for your body, your goals and the stage of life you're actually in. Our guide to working with a menopause personal trainer in Blackheath explains how sessions run in practice, from perimenopause to the years after.
What progress can look like
Women who train consistently through perimenopause can do more than maintain — some end up lifting more than they ever did in their 30s. Many women find the right training improves their energy, sleep, mood and body composition.
Everyone is different, and we will never promise outcomes or timescales. But progress tends to come more steadily when the training finally matches the body that's doing it. For medical concerns, always speak to your GP.
Ready to train smarter?
If you're in your 40s and feel as though your body has changed the rules without telling you — you're far from alone. Our perimenopause training is private and one-to-one, designed specifically for women at this stage: no crowded classes, no generic programmes, no guesswork. It starts with a free 30-minute introductory session at our Blackheath studio — a conversation about how you're actually feeling and a gentle look at how you move — with no pressure and no obligation. Book your free session.