Perimenopause and exercise: why what used to work stopped working

The short version

• Strength training becomes the anchor. Two to three full-body sessions a week, loads heavy enough that the final few repetitions are hard.
• Add impact for bone. Short, frequent doses of hopping, skipping, or bounding, because bone loss accelerates around the final period.
• Polarise your cardio. Mostly easy and conversational, plus one or two short genuinely hard efforts. Daily moderate slog is the least effective option.
• Eat more protein, not less food. Roughly 1.2 to 1.6 g per kg of body weight daily, spread across meals.
• Recovery is training. Hard days need easy days, and poor sleep means today is an easy day whatever the plan said.
• Track the response, not the effort. The pattern that matters is how your sleep, mood, joints, and energy respond over weeks.

Why your old plan stopped working: the biology, simply

• Muscle gets less responsive. Estrogen supports muscle repair and the anabolic response to training, so the same session produces less adaptation. Without progressive load, lean mass drifts down from the late 30s onward, and that loss lowers resting metabolic rate.
• Bone turnover accelerates. Resorption outpaces formation most sharply in the transition years around the final period, which is why loading bone matters more now than at any other point in adult life.
• Fat redistributes. Falling estrogen shifts storage from hips and thighs toward the abdomen and the viscera, which is a shape change even when the scale barely moves.
• Connective tissue changes. Estrogen receptors sit in tendon and cartilage, so tendinopathy, frozen shoulder, and joint ache appear more readily, especially with sudden increases in volume.
• Recovery capacity drops. Fragmented sleep and higher stress reactivity mean the same weekly load lands harder. Training stress you cannot recover from does not become fitness, it becomes fatigue.
• Thermoregulation shifts. A narrower comfortable temperature window makes hot rooms, midday runs, and heated classes feel disproportionately punishing.

What to keep, what to change, what to add

The four pillars, in priority order

1. Heavy resistance training, two or three times a week

This is the non-negotiable. Pick five or six compound patterns and progress them: squat or leg press, hip hinge or deadlift, a push, a pull, a loaded carry, and a hip or core anti-rotation movement. Work in the 4 to 8 repetition range for the main lifts, leaving one or two repetitions in reserve, and add load or repetitions whenever a session feels comfortable. Two well-executed sessions a week beat five rushed ones. Heavier loading is also what defends bone, tendon stiffness, glucose handling, and the ability to get off the floor unaided in your seventies.

2. Impact and power work, in small frequent doses

Bone responds to short, sharp, unusual loads rather than long steady ones. Something as small as 10 to 20 hops, drop-landings, or stair bounds on most days provides the stimulus, and supervised high-intensity resistance plus impact programmes have improved bone density and function in postmenopausal women with low bone mass. Build up slowly, land softly at first, and get clinical advice before impact work if you have osteoporosis, a previous fragility fracture, or ongoing pelvic floor symptoms.

3. Cardio, polarised

Keep hitting at least 150 minutes a week of moderate activity, but let most of it be easy enough to hold a conversation, which is where the cardiovascular and mood benefits accumulate without adding recovery debt. Then add one, maybe two, short hard sessions: 6 to 10 efforts of 20 to 60 seconds, or 4 to 6 efforts of two to four minutes, with full recovery between. Short and truly hard beats medium and relentless, and it is far kinder to a fragile sleep pattern than a daily grind.

4. Fuel, protein, and recovery

• Protein: 1.2 to 1.6 g per kg body weight daily, 25 to 40 g per meal, with a serving within a couple of hours of training.
• Do not train fasted by default. Some carbohydrate before hard sessions improves output and blunts the stress response.
• Calcium and vitamin D: the scaffolding for the bone work. Check levels rather than guessing.
• Sleep is the multiplier. Poor sleep reduces both muscle protein synthesis and appetite regulation, so training harder into a bad sleep week reliably backfires.
• Plan deloads. Every fourth to sixth week, halve the volume for a week. Most women feel stronger the week after.

A realistic week

1. Monday: full-body strength, 40 to 50 minutes, plus 15 hops before you start.
2. Tuesday: easy 30 to 45 minute walk or ride, plus mobility or Pilates.
3. Wednesday: full-body strength, different emphasis, plus one short hard set of intervals if you slept well.
4. Thursday: easy movement, balance and single-leg work, pelvic floor training.
5. Friday: strength or a hard interval session, whichever you have more energy for.
6. Weekend: one longer easy outing you actually enjoy, and one genuine rest day.

If that looks like less than you are doing now, it probably is. The point is that the hard sessions are actually hard and the easy ones are actually easy, which is where the adaptation lives.

Signs you are doing too much, not too little

• Soreness that lasts more than three days after a normal session
• Resting heart rate creeping up and sleep getting worse in training weeks
• Strength stalling or falling despite consistent sessions
• Getting ill more often, or niggles that move from joint to joint
• Dreading sessions you used to look forward to
• Appetite either vanishing or becoming uncontrollable in the evening

What to say at the appointment

"I'm [age] and I've been training consistently, but over the last [X] months I've lost strength, gained weight around my middle, and my recovery and sleep have got noticeably worse. I'd like my vitamin D, ferritin, and thyroid checked, I'd like to discuss whether a DEXA scan is appropriate given my risk factors, and I'd like to talk about whether hormone therapy is a reasonable option alongside the strength and impact training I'm doing."

How PeriSlayer connects this to the wider pattern

Training in perimenopause is a response problem, not a willpower problem, and the response only becomes visible across weeks. PeriSlayer logs your sessions alongside sleep, cycle day, mood, joint pain, and energy, then surfaces the correlations you cannot hold in your head, like the interval session that consistently wrecks the following night, or the strength week that only goes well when it lands in the first half of your cycle. Jorja's Pilates programme sits inside the app for the mobility, breathing, and pelvic floor side, the Peri-Pals community is there for the did-anyone-else-lose-all-their-strength-suddenly question, and the appointment summary turns all of it into something a clinician can act on.