Quick answer: Lift at least twice a week, working every major muscle group, and three times if you recover well and enjoy it. Two full-body sessions is the floor that WHO guidelines and most bone-health advice point to, and it is enough to build muscle and protect bone in perimenopause and beyond. Load matters more than frequency: the weights should feel genuinely hard by the last few reps.
“Lift weights” has become the standard advice for women in their 40s and 50s, and it is good advice. What it rarely comes with is a dose. How many sessions a week? How heavy? What happens when you also run, or when a bad night of sleep wrecks your week? This guide answers the frequency question first, then the questions that decide whether the plan survives contact with real life.
The short answer: two to three sessions a week
Two full-body strength sessions a week is the evidence-backed floor for women over 40, and three suits many lifters who recover well. The World Health Organization’s physical activity guidelines recommend muscle-strengthening activity at moderate or greater intensity, working all major muscle groups, on two or more days a week. The UK’s bone-health consensus statement, endorsed by the Royal Osteoporosis Society, suggests muscle strengthening on two to three days a week alongside impact work.
That is the whole prescription for most women. The rest of this article is about making those sessions count.
| Sessions per week | Who it suits | What to expect |
|---|---|---|
| 1 | Busy weeks, maintenance phases | Holds existing strength. A thin dose for new muscle or bone |
| 2 | Most women, and most runners | Builds strength and supports bone if the loads are heavy |
| 3 | Recovering well, strength is the main goal | Faster progress. Needs sleep and protein to back it |
| 4+ | Experienced lifters on a split | Only works if muscles get recovery between sessions |
Why twice a week beats once
Each muscle group responds better when it is trained at least twice a week. A widely cited 2016 meta-analysis by Schoenfeld and colleagues in Sports Medicine found greater muscle growth when muscles were trained two or more times a week compared with once. Later work suggests total weekly volume (the hard sets you actually do) drives most of that effect. In practice, two sessions is the easiest way to get enough hard sets in without each session becoming exhausting.
For women over 40 this matters more than it did at 30. Falling estrogen speeds up the loss of muscle and bone, so the training stimulus has to be regular enough to keep pace. One session a week tends to maintain. Two or three builds.
Load matters more than frequency
How often you lift matters less than how heavy you lift. If the last reps of a set are not genuinely hard, adding a third or fourth session will not fix it.
The clearest evidence comes from bone. In the LIFTMOR trial (Watson and colleagues, Journal of Bone and Mineral Research, 2018), 101 postmenopausal women with low bone mass did either a supervised program of heavy lifting and impact work or a low-intensity home program. The heavy program used sets of five at about 80 to 85 percent of maximum, twice a week, for 30 minutes per session. After eight months, lumbar spine bone density rose about 2.9 percent in the heavy group and fell about 1.2 percent in the low-intensity group. Femoral neck density improved slightly in the heavy group and declined in the comparison group.
Two short, heavy sessions a week did that. The lesson is not that everyone should start with sets of five. It is that the women who improved were lifting loads that challenged them, progressed gradually, under supervision. See lifting weights in perimenopause for how to build up to heavy loads safely.
What a session should include
A 30 to 45 minute session built on four or five big movements covers the whole body:
- A squat pattern: goblet squat, back squat, or leg press.
- A hinge: deadlift, Romanian deadlift, or hip thrust.
- A push: push-up, bench press, or overhead press.
- A pull: row or pull-down.
- A single-leg exercise: split squat, step-up, or lunge.
Two or three hard sets of each, with enough rest that you can lift well, is a complete session. Calf raises and core work fit at the end if you have time. Runners in particular benefit from calf and single-leg work, because that is where running injuries in perimenopause tend to start.
Fitting lifting around running
For runners, the right frequency is usually two sessions a week through every phase of training, including race builds. Placement matters more than the count:
- Lift on hard days. Pair a strength session with an interval or tempo day, ideally with the run first, so easy days stay easy.
- Or lift the day after an easy run. That keeps the day before your long run or key session fresh.
- Avoid heavy legs the day before a key run. You will run worse and lift worse.
- Drop to one session in race week, not zero. A light full-body session keeps the habit without adding fatigue.
Strength training for female runners over 40 covers the exercise choices in more detail.
How perimenopause changes the answer
Frequency stays the same in perimenopause, but recovery becomes less predictable. Sleep disruption, night sweats, and swings in energy mean the same session can feel easy one week and crushing the next.
The answer is not to lift less. It is to keep the schedule and let the intensity flex:
- Keep both sessions on the calendar. Consistency across weeks matters more than any single workout.
- Flex the load on bad days. After a bad night, cut a set or drop the weight and keep the session. A lighter session still counts.
- Plan easier weeks. A deload every few weeks, where you lift lighter on purpose, keeps progress steady rather than lurching between pushing too hard and forced rest.
- Back it with protein. Muscle repair needs raw material, and most women over 40 eat less protein than strength training calls for.
If your cycle is still running, many women find heavier, harder sessions fit better in the first half of the cycle, when energy is often higher, with lighter weeks around the late luteal phase. That is a useful pattern to test, not a rule. Your own check-ins will tell you more than a calendar.
What about bone?
Lifting is half of the bone prescription. The other half is impact. The UK bone-health consensus recommends building up to around 50 moderate impacts (small jumps, hops, skips, or jogging) on most days, alongside two to three strength sessions a week. Lifting loads bone through muscle pull; impact loads it through the ground. See plyometrics for bone density for how to add jumps safely.
Where Phaes fits
Phaes builds a strength plan around how often you can realistically lift, then waves the load with your cycle (heavier blocks when you are likely to recover well, planned deloads when you are not) and adjusts each session to your daily check-in. If you are in perimenopause and your cycle no longer gives a reliable signal, the check-in carries the plan. We do not just tell you to lift twice a week. We read how you slept and how you feel and set the weight for today.
The bottom line
Lift two to three times a week, working the whole body, with loads that feel genuinely hard by the last few reps. Two sessions is the floor, and it is enough to build strength and protect bone if the weights are heavy and you progress them. Pair it with impact, enough protein, and a schedule that bends on bad days without breaking.
Frequently asked questions
How many days a week should a woman over 40 lift weights?
Two to three days a week. The World Health Organization recommends muscle-strengthening activity that works all major muscle groups on two or more days a week, and the UK's bone-health consensus suggests two to three. Two full-body sessions is enough for most women to build strength and protect bone. A third session helps if you recover well and want faster progress.
Is lifting once a week enough after 40?
Once a week is far better than nothing and can maintain strength you already have, but it is a thin dose for building muscle or bone. Research on training frequency suggests each muscle group responds better when it is trained at least twice a week. If one session is all you can fit, make it full-body and genuinely heavy, and treat it as the minimum rather than the plan.
Can I lift weights every day in perimenopause?
You can, but most women do not need to, and recovery tends to slow in perimenopause. Daily lifting only works if you split the body so the same muscles are not trained hard on consecutive days. For most women over 40, two or three well-loaded sessions with recovery between them beat five or six tired ones.
Should I lift heavy or do more reps over 40?
Lift heavy enough that the last two or three reps of each set are hard, whether that is 5 reps or 12. For bone in particular, higher loads matter: the LIFTMOR trial in postmenopausal women with low bone mass used heavy sets of five and found improved spine and hip bone density. Build up to heavy loads gradually with good technique rather than starting there.
How do I fit lifting around running?
Put lifting on your hard running days or the day after an easy run, not the day before a long run or key session. Keeping hard days hard and easy days easy protects the recovery between them. Two sessions a week through every phase of training, including race builds, is a sensible default for runners over 40.
How long should a strength session be?
Thirty to forty-five minutes is enough. The LIFTMOR program that improved bone density ran just 30 minutes, twice a week. A short session built on four or five big movements (a squat, a hinge, a push, a pull, and a single-leg exercise) done with real effort will do more than a long session of light accessory work.