The Kosak Method · Prime Midlife
Live in your Prime.
Strength training, Zone 2 cardio, nutrition and recovery built for midlife. Train on your own in the app, or 1:1 with Coach Chris.
Studio from $29.99/month · 1:1 coaching by application
Is this what aging really looks like?
Wait… is this perimenopause?
You've always known how to take care of yourself. If something felt off, you fixed it: move more, eat well, get some sleep, and you felt like yourself again. It was that simple. Then, almost out of nowhere, it wasn't. You're up at 3 a.m., you can't focus, your joints ache, and the workouts that always worked have just stopped working. You're doing all the right things and getting none of the results. It's frustrating, and what you're feeling is real.
Here's what's happening. In perimenopause, your hormones start to fluctuate, and your metabolism shifts right along with them. That's behind so much of what you're feeling: the restless nights, the energy dips, the mood changes, the weight that won't budge. But you don't have to just live with it. You can't control every hormone shift, but you do have tools to work with. Lifting weights, protein at every meal, daily walks and true recovery support your metabolism and can ease your symptoms. Paired with your provider's guidance on options like hormone therapy, supplements or medication, these changes can make a real difference in how you feel.
Prime Midlife brings it all together in one plan: your workouts, plus nutrition and lifestyle education from a women's health nurse and fitness coach. No more piecing it together on your own.
Inside the app
Your workouts, ready when you are.
Open the app and today's session is waiting: Home or Gym, a video demo for every move, and the Welcome Guide with the why behind the plan.
What's inside
Simple by design. No overwhelm.
Nobody needs more on their to-do list. Open the app, do today's session, and add the extras only if you want them.
Workouts in the app
3 strength days a week, with an optional 4th whenever you want it. Home and Gym versions, video demos for every move, and a new block every 6 weeks.
Activate: where everyone starts
The day you join, you start Activate: three full-body workouts that teach you the moves and build your base, with bodyweight versions on YouTube. You stay in Activate until the next 6-week block begins, then you start that block with everyone else.
Zone 2 cardio and intervals
2 Zone 2 cardio days (an easy, steady pace where you can still talk) that build from 15 to 30 minutes, for your heart and metabolism. Once you finish Activate, you can add short intervals as an option.
Midlife tips with every block
Each 6-week block comes with training, nutrition and lifestyle tips for this stage: sleep, protein, fiber, creatine, stress and more. Turn the ones you like into habits at your own pace.
The Welcome Guide
The why behind the plan: hormones, brain, heart, bone, metabolism, sleep and mood, plus the nutrition basics. Sent the day you join.
The Prime Midlife Tracker
Log your symptoms in less than a couple of minutes a night, see your patterns, and bring a clear summary to your provider. Free, and private to your phone.
Weekly plan
A plan that fits a full life.
Strength is the anchor. Zone 2 cardio and walks round it out for your heart and metabolism. Rest is part of the program.
Every strength day opens with a short power block (landings and jumps, with a heel-drop option if jumping doesn't feel right for your joints or pelvic floor) because power is one of the first things to fade with age. Rough night? Swap in the lighter session. Life happens. If you miss a strength day, move it to another day that week, or skip it altogether if you need to.
How it works
Join today. Start today.
Join the Studio
Sign up in a couple of minutes. Your app invite and the Welcome Guide arrive right away.
Start with Activate
Learn the moves, build your base and set up your tracker. You stay in Activate until the next block starts.
Train in 6-week blocks
When the next block starts, you start it with everyone else. A new block is released every 6 weeks.
Why this works
Train for the stage you're in.
Midlife women's health was under-researched for decades. The newer research is clear: strength training, cardio and protein support every system that changes in this stage.
- MuscleYour muscle is your medicine. Holding onto it supports strength, balance and blood sugar control for decades.
- BoneBone loss speeds up around menopause. Lifting weights and short jumps put healthy stress on your bones, which helps keep them strong.
- HeartHeart disease risk climbs in midlife. As estrogen declines, cholesterol tends to rise and blood vessels get stiffer. Zone 2 cardio, walking and intervals keep your heart strong.
- BrainExercise and steady fuel support focus and memory when estrogen fluctuates and brain fuel gets less steady.
- MetabolismMetabolism runs your whole body, not just your weight. When it slows, midsection weight gain is often the first sign, and blood sugar, cholesterol and heart health follow. More muscle and smart cardio keep it working for you.
- Sleep and moodRegular training, a consistent wake time and a wind-down routine help sleep and mood.
Meet your coach
Built by a nurse and women's fitness coach who's going through it too.
I'm Christine, a women's health nurse and certified personal trainer. I was a competitive gymnast for 13 years and an athlete my whole life. I loved HIIT, boot camp and cardio classes, until they stopped working for me in my 40s.
So I changed my approach. I started lifting with a strength coach, put protein first, and dug into the research on sleep, estrogen, muscle and bone. Strength, protein and recovery became my lifestyle, and Prime Midlife is everything I learned, built into a plan you can follow and turn into a lifestyle.
Let's go. 🤎
Join
Choose how you want to train.
Both include the app, the workouts, the Welcome Guide, the midlife tips and the tracker.
Follow the plan in the app at your own pace. Join anytime.
- Home and Gym workouts, new every 6 weeks
- Activate on-ramp from the day you join
- Video demos for every move
- Midlife tips with every block, plus the Welcome Guide
- The Prime Midlife Tracker
Join anytime. No application needed.
Everything in the Studio, with your plan built and adjusted around you.
- Programming built for your body, schedule and goals
- Regular check-ins and form feedback in the app
- Nutrition and recovery guidance for this stage
- Direct messaging with a women's health nurse
- Your tracker and labs reviewed 1:1 with Coach Chris, RN
- Education on supplements, HRT, peptides and GLP-1 medications, whenever you want it
By application. Limited spots.
Coming soon
Prime Midlife Clinical.
Hormone therapy, peptides and GLP-1 medications, through our independent, licensed medical provider partners. A provider evaluates what's right for you and prescribes when appropriate. Coach Chris, RN, CPT guides you with RN-led education and coaching, so your treatment and your training work together.
- Lab workLabs ordered and reviewed by our partner providers, plus a walk-through of your results with Coach Chris, RN, CPT.
- Hormone therapy (HRT)Menopause hormone therapy, when your provider says it's right for you.
- GLP-1 medication supportAccess to GLP-1 medications through a provider, with strength and protein coaching to protect your muscle.
- PeptidesProvider-prescribed peptides from licensed pharmacies.
- Your tracker, put to workYour symptom data guides your care plan and your coaching.
Free · Start here
Bring real data to your provider.
The Prime Midlife Tracker takes less than a couple of minutes to fill out each night. Rate your symptoms, tap your habits, and see your patterns across every week you log. Your Provider Summary covers your latest 28 days, ready to copy or print so your visit starts with facts. Coached members get their tracker reviewed 1:1 with Coach Chris. And coming soon with Prime Midlife Clinical, your tracker data helps guide your care plan.
Questions
Good to know.
Do I need a gym?
No. Every workout comes in a Home version (dumbbells, bands, a mini band, a bench or step, a stability ball and a mat, with a kettlebell optional) and a Gym version. Switch between them whenever you like.
What is Zone 2 cardio?
Easy, steady cardio where you can still hold a conversation: a brisk or incline walk, an easy bike ride or a light jog. It builds your heart health and metabolism without wiping you out.
I'm new to strength training. Is this for me?
Yes. Everyone starts in Activate: three full-body workouts with a video demo for every move, plus bodyweight versions on YouTube. If you already lift, you can add a short HIIT finisher to the end of your Activate sessions.
When can I start?
Today. You start Activate the day you join and stay in it until the next 6-week block begins. Then you start that block with every other member. A new block is released every 6 weeks.
How much time does it take?
Each strength session has a 5-minute warm-up, a short power block, strength with a core finisher, and a 5-minute cool-down. Zone 2 cardio builds from 15 to 30 minutes. One day a week is a full rest day.
I'm on hormone therapy, or thinking about it. Does that matter?
The program works either way. Strength, cardio, protein and sleep matter whether or not you use HRT. The tracker lets you log your hormone therapy and any changes, so you and your provider can see how your symptoms respond. Coming soon, Prime Midlife Clinical will offer hormone therapy through licensed medical providers.
I'm on a GLP-1 medication. Is this for me?
Yes, and it matters even more. GLP-1 medications can cause muscle loss along with fat loss, so strength training and protein at every meal help protect the muscle you have.
What if I have joint pain, pelvic floor symptoms or osteoporosis?
The workouts include joint-friendly swaps, and the power block has a heel-drop option instead of jumps. If you have leaking, pelvic heaviness or osteoporosis, use the heel-drop option and check in with your provider or a pelvic floor physical therapist. Coached members get a plan adjusted around these.
What is Prime Midlife Clinical?
It's coming soon: lab ordering and reviews, hormone therapy, peptides and GLP-1 medication support through our licensed medical provider partners, paired with coaching from Coach Chris. Join the waitlist to be first in line when it opens.
Is this medical advice?
No. Prime Midlife is education and training from a women's health nurse and strength coach. It doesn't replace care from your provider. Check with your provider before starting a new exercise program, especially if you have a health condition.
Prime Midlife
Built for this stage. Ready when you are.
Train in the Studio from $29.99/month, or work 1:1 with Coach Chris.