Training Through Perimenopause: A Guide for Female Endurance Athletes
"Something's shifted and I don't know what. The training that worked in my thirties just isn't working anymore."
I hear a version of this almost every week. From runners. From triathletes. From women who have trained for years and suddenly feel like their own body has changed the rules without telling them.
Here is the honest bit up front. Perimenopause is not the end of your best running. It is a signal to train differently. The women who struggle are the ones who keep doing what used to work and push harder when it stops. The women who thrive are the ones who change the plan. This is how you change the plan.
Your oestrogen is fluctuating, not just falling
Perimenopause is the years-long run-up to menopause, often starting in the early forties and sometimes the late thirties. Oestrogen and progesterone do not glide gently downhill. They swing. Wildly, some months.
Oestrogen protects muscle, bone, and recovery. As it becomes erratic, you lose some of that protection. Research summarised by Dr Stacy Sims points to a meaningful drop in the muscle stem cells that repair and build tissue across the menopause transition. That is why the old plan stops working. Same effort, less return.
None of this means decline is inevitable. It means the training stimulus has to get stronger and smarter to do the same job.
The Old Plan That Stops Working
Most women arrive in perimenopause running a lot of steady, moderate miles, lifting occasionally if at all, and quietly under-eating. In your thirties you got away with it. Now that exact combination works against you.
Living in the moderate middle
Endless steady runs at the same comfortable pace. Not easy enough to recover well, not hard enough to force adaptation. In perimenopause this grey-zone training raises stress without the payoff.
Fix: Go properly easy on easy days, and properly hard on hard days. Polarise. Protect the recovery so you can hit the hard stuff.
Skipping strength, or lifting light
Light weights and high reps feel productive but they no longer give a strong enough signal to hold onto muscle and bone as oestrogen drops.
Fix: Lift heavy. Fewer reps, real load, good technique. This is the single biggest lever you have right now.
Under-fuelling and under-proteining
One study of perimenopausal women found average protein intake sitting around 64g a day. That is nowhere near enough to hold muscle through this transition.
Fix: Eat more, and eat more protein specifically. Numbers below.
Ignoring recovery and sleep
Recovery slows in perimenopause and sleep gets disrupted by hormonal changes. Training through exhaustion digs the hole deeper.
Fix: Treat sleep and recovery as part of the training, not the reward for it.
The Perimenopause Training Reset
A one-page reset for female endurance athletes. What to add, what to drop, and the protein and strength targets that actually matter through the transition. PDF, straight to your inbox.
The New Plan: Four Shifts That Work
This is the framework I use with the women I coach through perimenopause. It is not more training. It is different training, aimed at the things oestrogen used to do for free.
1. Lift heavy, two to three times a week
Heavy resistance training is the strongest signal you can send to hold onto muscle and bone as hormones decline.
- Compound lifts: squats, deadlifts, hip thrusts, presses, rows.
- Heavier load, lower reps. Think sets of 3 to 6 with proper effort, not endless 15s with a pink dumbbell.
- Endurance athletes can hold this to twice a week in a race build, three times in the off-season.
- Technique first. Build load gradually. This is a long game.
2. Add real intensity with sprint intervals
Short, sharp, all-out efforts help maintain power, body composition, and metabolic health through the transition.
- Sprint interval work: efforts of roughly 10 to 30 seconds, all-out, with full recovery between.
- On the bike, on a hill, or on flat ground. Swimming counts too.
- Once or twice a week is plenty. Quality over quantity.
- Pair it with your lifting days where you can, so easy days stay genuinely easy.
3. Add impact for your bones
Falling oestrogen accelerates bone loss. Impact and load tell your bones to stay dense.
- Running already helps. Add short bouts of jumping and hopping, built up gradually.
- Heavy lifting doubles as bone loading. Two wins from one session.
- If you have any bone health concerns, get them checked and build impact slowly.
4. Fuel and protein it properly
You cannot build or hold muscle on a deficit. Fuelling is the foundation the rest sits on.
- Protein: aim for roughly 1.8 to 2g per kg of body weight per day.
- Spread it out: around 30g per meal, plus 15 to 20g with snacks.
- Eat carbohydrate around your hard sessions. Your body still runs on it.
- Do not fast-train your way through perimenopause. It backfires.
What About Your Cycle While It's Still Here?
In perimenopause your cycle often becomes unpredictable. Longer, shorter, heavier, skipped. That is normal for this stage, though anything that worries you is always worth a conversation with your GP.
My approach is the same one I use across every life stage. Manage your cycle, do not sync to it. Rigid cycle-syncing plans fall apart the moment your cycle stops being predictable, which is exactly what perimenopause does. Instead you learn to read your own signals, adjust the hard days when you genuinely need to, and keep the structure steady. It is calmer, and it works in real life.
The Short Version
Perimenopause is not decline. It is a signal to train differently, starting in your early forties or sometimes late thirties.
The old plan of steady miles, light lifting and under-eating stops working because oestrogen is no longer protecting muscle, bone and recovery.
Lift heavy two to three times a week. It is your biggest lever.
Add short sprint intervals and some impact. Keep easy days genuinely easy.
Eat enough, and hit 1.8 to 2g of protein per kg per day.
Manage your cycle, do not sync to it. Protect your sleep and recovery like they are training.
Your best endurance chapter is not behind you. It just needs a different plan. Brick by brick.
Sound familiar?
- The training that worked in your thirties has quietly stopped working
- You suspect perimenopause is part of it, but no one has given you a plan
- You want to get stronger through this, not just manage a slow decline
- You want a coach who understands the female body across every life stage, not one who tells you to push through
If you ticked two or more, this is exactly what I coach women through every day.
Apply to work with me →If you want a plan built for your body in this exact chapter, that is what I do.
Female-specific endurance coaching with performance nutrition and fertility nutrition built in. Training that works with perimenopause, not against it. Strength, fuelling and recovery, all in one place.
The application takes two minutes. I read every one myself. I will WhatsApp you within 24 hours on weekdays.
Apply to work with me →Frankie x