Today’s Topic
If you’re over 40 and think your daily 10,000 steps are keeping you fit, I’ve got news that might sting a bit.
Professor Hong Jung-ki, one of South Korea’s leading sports medicine experts, has spent decades training elite athletes and treating weekend warriors alike. His message to anyone approaching middle age is blunt: “Walking isn’t exercise. It’s baseline activity.” If you’re relying on it to maintain muscle, you’re fighting a losing battle.
Here’s the reality. From around age 40, your body steadily loses muscle — roughly 3–8% per decade — and the decline accelerates after 60, taking strength and power with it. By your 70s, if you haven’t built what Professor Hong calls a “muscle pension,” you’re facing a dramatically increased risk of falls, fractures, and loss of independence.
The good news? This decline isn’t inevitable. But the solution requires a fundamental shift in how most people think about exercise after 40.
Q&A: The Truth About Muscle Loss and Ageing
Q1. Why should I care about muscle loss? I feel fine.
Here’s the thing about muscle loss after 40 — you don’t notice it until it’s already taken a significant toll.
Professor Hong calls this the “Superman Syndrome.” Throughout your 50s, you still feel invincible. You can still do most of what you’ve always done. But underneath, muscle is steadily disappearing. By your 60s, osteoporosis starts showing up (especially in women). Your 70s bring pelvic misalignment and chronic musculoskeletal pain. And by your 80s, balance deteriorates to the point where falls become a genuine threat to your life.
The statistics here are sobering. Four in ten people over 70 experience falls. Falls cause more than 95% of hip fractures, and roughly one in five hip-fracture patients die within 12 months — while many survivors never fully regain their independence.
This isn’t meant to scare you. It’s meant to wake you up to the fact that what you do in your 40s and 50s determines your quality of life in your 70s and 80s. Muscle isn’t just about looking fit or lifting heavy things. It’s about maintaining independence, preventing falls, and literally extending your lifespan.
When Professor Hong works with patients in their 40s, he’s not just preventing injury. He’s helping them build a “biological insurance policy” for the decades ahead.
Q2. I walk 10,000 steps every day. Isn’t that enough?
This is probably the most common misconception I encounter, and it’s doing genuine harm.
Walking is fantastic. It’s better than sitting. It keeps joints mobile, burns some calories, and provides cardiovascular benefits. But here’s what walking doesn’t do: it doesn’t build or maintain muscle mass.
In fact, Professor Hong has observed something counterintuitive in his practice. People who suddenly start walking 20,000 or 30,000 steps per day — often after a health scare — frequently LOSE more muscle than people who walk less. How is that possible?
Low-intensity cardio like walking can actually consume muscle tissue, especially if you’re not eating enough protein or doing resistance training. Your body needs amino acids to fuel those long walks, and if they’re not coming from your diet, they’re coming from your muscles.
Think of it this way. Walking is baseline activity. It’s what humans evolved to do constantly. It’s not a training stimulus. Your body has no reason to build or maintain muscle in response to walking because walking doesn’t challenge your muscles beyond their normal capacity.
My recommendation is to keep walking. Aim for 7,000–10,000 steps on most days. But stop counting it as exercise. It’s movement. It’s healthy. But it’s not building the muscle you desperately need to maintain as you age.
The real work happens when you pick up heavy things. That’s when your body says, “Right, I need to adapt to this stress. I need to build stronger muscles.”
Q3. What are the biggest exercise mistakes people make?
Professor Hong has identified five damaging patterns — from panic-driven overtraining and misusing park equipment to copying exercise form off YouTube. Because they deserve a full breakdown (especially for runners), I've covered all five in a dedicated guide: The 5 Exercise Mistakes Destroying Your Muscles After 40. Read that next, then come back here.
Q4. You keep saying strength training is essential. But what does that actually mean?
Great question, because “strength training” means different things to different people.
For our purposes, strength training means resistance exercise that progressively challenges your muscles to adapt and grow stronger. It must meet two criteria:
It must be challenging. If you can easily do 20 repetitions of something, it’s not strength training. You’re training endurance.
It must be progressive. Once an exercise becomes easy, you need to increase the difficulty — more weight, more reps, or slower tempo.
For someone starting in their 40s or 50s, Professor Hong recommends working with a professional to establish a foundation (2–3 sessions per week).
Basic Session Example:
Goblet Squats: 3 sets of 8–10 reps
Romanian Deadlifts: 3 sets of 8–10 reps
Push-ups (modified if needed): 3 sets of 8–12 reps
Dumbbell Rows: 3 sets of 8–10 reps per side
Plank Holds: 3 sets of 20–30 seconds
Note: The weight should be challenging for the last 2–3 reps of each set.
Q5. I’m a runner. Why do I need strength training?
This is particularly relevant given our audience. Let me be direct: Running without strength training is a recipe for injury, especially after 40.
When you run, you’re landing with 2–3 times your body weight on each foot. If your muscles aren’t strong enough, the stress transfers to passive structures — tendons, ligaments, cartilage, bone. That’s when you get Achilles tendinopathy, runner’s knee, and stress fractures.
Professor Hong notes that elite runners do strength training without exception. Stronger glutes mean more powerful push-off. Stronger quads mean better shock absorption. Stronger core means better running economy. For runners over 40, focus on single-leg exercises (lunges, split squats), hip strengthening, and core stability.
Q6. What about women? Do they need to train differently?
The short answer: Not fundamentally, but there are important considerations.
Professor Hong notes that a relatively few women do regular strength training. This is a tragedy, because women need strength training even more urgently than men.
Women start with less muscle mass than men and face accelerated bone density loss after menopause (Osteoporosis). The fear of “getting bulky” is unfounded. Women lack the testosterone levels to build large muscles accidentally. What you will build is functional strength, bone density, and metabolic health.
Data shows that resistance training is the single most effective intervention for maintaining bone density in postmenopausal women — more effective than calcium supplements or walking.
Q7. How do I know what exercises MY body actually needs?
This is where professional assessment becomes non-negotiable.
Most people have imbalances — one hip tighter than the other, one shoulder weaker. A qualified physiotherapist or strength coach can perform a Functional Movement Screen (FMS).
For example, many runners have tight hips and weak glutes. They compensate by overusing their lower back, leading to chronic pain. The solution isn’t more running or stretching; it’s targeted hip mobility and glute strengthening. Invest in an assessment. It’s cheaper than months of physiotherapy after an injury.
Q8. What are the most common mistakes people make when they start?
Starting too heavy, too soon: Your muscles adapt quickly, but your tendons and ligaments take 12–16 weeks. If you increase weight too fast, you’ll get tendinopathy. Start light and progress gradually.
Ignoring pain signals: Discomfort (burning muscle) is fine. Pain (sharp, localized) is a stop signal.
Not eating enough protein: Muscle doesn’t appear from nowhere. Older adults need more protein than younger people to stimulate muscle synthesis. Aim for 1.6–2.2g of protein per kg of body weight daily.
Q9. I’m intimidated by gyms. Can I build muscle at home?
Absolutely. You don’t need a fancy gym. A basic home setup (resistance bands, adjustable dumbbells, pull-up bar) is sufficient. Bodyweight exercises like pistol squats, push-up variations, and inverted rows can be very challenging. The key is Progressive Overload. When it gets easy, make it harder.
Q10. How long before I see results?
Neurological adaptation happens in 2–4 weeks (exercises feel easier). Measurable muscle growth typically takes 8–12 weeks of consistent training. But the real benefits — bone density, metabolic health — accumulate over years. You are building a “muscle pension” for your 80s. It is never too late to start; even people in their 80s can build muscle with proper training.
Practical Application Guide
Step 1: Get a Professional Assessment
Before you touch a weight, find a qualified professional (physio or coach). Book a functional movement screening to identify imbalances and get a personalized prescription.
Step 2: Start with a Structured Programme
Don’t guess. For beginners, a full-body routine 2–3 times per week is best.
Session A: Squat pattern, Push pattern, Hinge pattern (Deadlift), Plank.
Session B: Lunge pattern, Pull pattern (Row), Overhead Press, Core.
Alternate A and B with rest days in between.
Step 3: Track Progress
Keep a journal. Record weights, reps, and sets. Aim to increase the challenge slightly every 1–2 weeks. If you aren’t progressing, you aren’t adapting.
Essential Principles
Strength training is non-negotiable after 40. Walking is healthy, but it won’t prevent muscle loss.
Professional instruction is an investment. It saves you from injury and wasted time.
Do what your body needs, not what you enjoy. Address weaknesses and imbalances.
Start light, progress gradually, be consistent. You are training for the next 30 years.
Prioritize Protein. 1.6–2.2g per kg/body weight is the target.
Closing Thoughts
If you’re reading this in your 40s or 50s, you are at a critical junction. The decisions you make now about how you train will determine your quality of life in your 70s and 80s.
Muscle loss after 40 is predictable, but it’s not inevitable. With proper strength training, adequate protein, and consistency, you can maintain and even build muscle well into your later years.
Professor Hong’s message is urgent but hopeful. The statistics on falls and fractures are sobering, but they are not your destiny. They are what happens when people neglect strength training.
You have agency here. The best time to start was 10 years ago. The second-best time is today.
Your future self is counting on you.
This Week’s Challenge: Book a functional movement assessment with a qualified professional. Get the information you need to train smart, not just hard.