Somewhere in your late 30s or 40s, your body starts changing the rules without sending a memo. The workouts that used to work stop working. Sleep gets weird. Your shoulder freezes up for no reason. You gain a little weight around the middle even though you swear you haven’t changed a thing. And when you mention any of this to friends, half of them nod as if you’ve just described their whole year.
None of that is in your head, and none of it means you’re failing. It means your hormones are shifting, and the training and nutrition advice most of us grew up with was built for men, then handed to women with a pink label on it.
Dr. Stacy Sims, an exercise physiologist who has spent her career studying female athletes, has a phrase for this: women are not small men. The research on how women’s bodies respond to training and food is finally catching up, and the practical takeaways are surprisingly simple. They are also, for a lot of women, the opposite of what they’ve been doing.
So here is the short version, with the science behind it.
First, the part that isn’t about your body
Ask any woman who lifts what changed when she started, and she’ll probably mention her deadlift eventually. But first she’ll tell you about walking into rooms differently. About being the one who carries the suitcase up the stairs. About feeling, maybe for the first time in a while, like her body is on her side.
Strength is a superpower, and only some of that superpower is muscle. The rest is confidence, a steadier mood, a sense that hard things are doable. Perimenopause has a way of shaking all three, which is exactly why this is the moment to build them on purpose.
Lift heavier, not just more
In your 20s and early 30s, lighter weights with high reps and lots of burn worked fine. Estrogen was quietly supporting muscle repair and recovery in the background. From the mid-30s on, estrogen starts to fluctuate, and that automatic support fades.
Sims recommends shifting toward heavier loads and fewer reps: think 4 to 6 reps per set, with a couple of reps still left in the tank, using big compound movements like squats, deadlifts, overhead presses, and rows. Heavy loads recruit the nervous system in a way light, high-rep work doesn’t, and that neural stimulus drives strength, power, and muscle retention when hormones are no longer doing it for you.
A few things worth knowing:
- Strength gains come quickly at first because your nervous system learns to recruit muscle more efficiently. You get stronger before you get bigger, and for most women, “bigger” never really happens. Women don’t have the testosterone for it.
- You get stronger before you get bigger, and for most women, “bigger” never really happens. Women don’t have the testosterone for it.
- Bone is the other reason to load heavy. The years surrounding menopause are when women lose bone fastest, and lifting is one of the few things that tells bone to hold on.
Jump. Yes, really.
Bone responds to impact. Sims points to research where short bouts of jump training, roughly 10 minutes a few times a week, improved bone density in women who were already osteopenic. If jumping sounds terrifying, it can start as small hops, step-ups, or skipping, and build from there. The point is that bone needs a reason to stay strong, and impact is the reason.
Rethink the “middle” or endless time on a cardio machine.
Most group fitness lives in the moderate-intensity zone: hard enough to sweat, not hard enough to sprint. It feels productive. Sims argues that for women in midlife, it’s the least useful place to spend most of your cardio time, because it raises stress hormones without delivering the strength or power adaptations that heavy lifting and true high-intensity work provide.
Her alternative is polarized training. Go easy most of the time (walks, easy bike rides, conversational pace), and go truly hard a little of the time: short sprint intervals of 20 to 30 seconds at all-out effort, followed by two to three minutes of full recovery. That kind of intensity is hard to reach in a class where you’re pacing yourself for 45 minutes. The easy stuff still matters for mental health and recovery. It just shouldn’t be mistaken for the training that changes body composition.
There’s a bonus here for the brain. High-intensity exercise and strength training both support brain health as we age, and women face higher rates of Alzheimer’s than men. The window to invest is decades before any symptoms would show up.
Fuel the work
Fasted training has been sold to women as a fat-loss hack. Sims’s research argues the opposite: when a woman trains without fuel, her body is more likely to break down lean muscle for energy, and she can’t reach the intensities that make the workout worthwhile in the first place. The result is a harder session with less to show for it.
Her practical guidance:
- Eat something within an hour of waking, even if it’s small.
- Before strength training, aim for at least 15 grams of protein.
- Before a cardio session, have 15 grams of protein plus around 30 grams of carbohydrate. Not a meal, just enough to tell your body fuel is available.
- Eat within about 45 minutes after training. For perimenopausal and menopausal women, Sims recommends 40 grams or more of quality protein in that window, because the body is less efficient at using protein to rebuild muscle as estrogen declines.
Total daily protein matters too. Most women eat far less than what the research suggests for maintaining muscle in midlife. A reasonable target is higher than you think, and a registered dietitian or your physician can help you find the right number for you.
Creatine isn’t just for the guys at the squat rack
Creatine monohydrate is one of the most studied supplements in existence, and the evidence for women is strong and growing. At 3 to 5 grams a day, it supports muscle, strength, and recovery, and there’s good research on cognition and mood, both of which take a hit during the menopause transition. Women also tend to have lower baseline creatine stores than men.
No loading phase, no cycling. Just take it daily. The two worries that keep women away from it, hair loss and bulking, aren’t supported by the evidence. As with any supplement, it’s worth a quick conversation with your doctor, especially if you have kidney concerns.
Listen to the signals
Perimenopause can begin in the mid-30s, and the earliest signals often show up in the gym before they show up on a lab test. Training that stops producing results despite consistent effort. Body composition drifting with no change in habits. Lighter, more interrupted sleep. Frozen shoulder or plantar fasciitis, both of which are linked to estrogen fluctuation.
If that list sounds familiar, it’s not a reason to train harder in the same way. It’s a reason to train differently, and to talk with a clinician who understands this stage. Heavy lifting, real intensity, better fueling, and more protein aren’t a replacement for medical care. They are the foundation that makes everything else work better.
The Short Version
And the payoff isn’t only a stronger body. It’s walking into the second half of life feeling like you’re the one holding the weight, not the other way around.
If you’re in the Durham area and want help putting this into practice, Empower Fitness offers private training and small group classes designed for exactly this stage of life, including StrongHER, our strength program built for women. Learn more at becomepowerful.com.
The training and nutrition recommendations above are drawn from the work of Dr. Stacy Sims. I am a big fan of her work, and I encourage you to follow her: IG – @drstacysims
Here’s to our Superpowers Ladies,
💪🏽 Jess Bottesch
