The Mental Health Benefits of Strength Training Nobody Talks About
Everybody knows lifting weights is good for your muscles and your bones. Fewer people know the case for your mood is just as strong — backed by real research, not the kind of "exercise releases endorphins!" line you've heard a hundred times and tuned out.
That matters here specifically. A lot of you didn't walk into EXL chasing a number on a barbell. You walked in coming off a rough stretch — a layoff, a divorce, an empty nest, a health scare, a stretch of just feeling flat. Training became what got you out of the house and around other people. That's not a coincidence, and it's not just in your head. It's measurable.
This September we're spending two posts on the mental health side of what we do here — something we don't say out loud as often as we should. This week is the research. Next week is something more direct.
The Study That Should Have Made Headlines
In 2018, a team led by Brett Gordon pooled 33 randomized controlled trials — 1,877 people total — testing resistance training against depressive symptoms. The result: a moderate, statistically solid reduction in depression, roughly on par with what you'd see from aerobic exercise.
Here's the detail that should have made this bigger news than it was. The researchers checked whether the benefit depended on how much people trained, how long the program ran, how intense it was, or — this is the one that surprised even the researchers — whether people actually got stronger. None of it mattered. People who didn't measurably increase their strength got roughly the same mental health benefit as people who did.
Sit with that for a second. If this were purely a biological effect of building muscle, you'd expect the people who built more muscle to feel better. They didn't, not more than anyone else. Something else is going on.
So What's Actually Happening?
Nobody has this fully nailed down, and we're not going to pretend otherwise — that's not how we do things here. There are a couple of real candidates, and they're probably both partially right.
One is physiological, and there's a genuinely new piece of it. A study published this May in Molecular Psychiatry found that exercising skeletal muscle releases a protein called apelin directly into the bloodstream. Apelin crosses the blood-brain barrier, reaches the hippocampus, and appears to strengthen neural connections and support new neuron growth there. When researchers blocked muscles from producing apelin, running stopped producing its usual antidepressant-like effect in the animals — and artificially raising apelin reproduced the benefit without the exercise. That's about as close as this kind of research gets to nailing down cause and effect.
Here's the caveat we're not going to bury: that study was done in mice, in small groups, only in males so far, and using running rather than resistance training. It's a real, brand-new discovery — not yet a proven human mechanism, and not yet tested with lifting specifically. Female mice, human trials, and resistance-training protocols are the obvious next steps. File it under "promising and worth watching," alongside brain-derived neurotrophic factor (BDNF), the older and better-documented signal exercise triggers in the brain. Both are pieces of the "how," not the whole answer — and neither changes what the human strength-training data above already shows.
The other candidate is psychological, and it's the one the Gordon data actually points toward: mastery. A smaller 2024 study following 43 adults (average age 45) through a 16-week barbell program found meaningful increases in two specific things — self-reported mastery and resilience — along with a measurable jump in how competent people felt handling complex, unfamiliar physical tasks. Not confidence in general. Confidence earned from doing something hard, correctly, under a bar that doesn't care how your week went.
That tracks with what a lot of you have told us directly. The weight room is one of the only places left where effort and outcome are directly connected. You put in the work, the numbers move. Nothing else in most people's lives works that cleanly anymore.
The Part We're Not Going to Oversell
If you're dealing with clinical depression or an anxiety disorder, training is not a replacement for therapy or medication — and anyone selling you strength training as a cure is selling you something. The research shows a real, moderate effect on symptoms. It doesn't show that lifting fixes clinical depression on its own, and we're not going to tell you it does.
What it does show is that resistance training is a legitimate part of the toolkit — not a wellness platitude, not a marketing angle, an actual evidence-backed intervention that stacks on top of whatever else you're already doing for your mental health, including nothing else at all if you're not there yet.
Why This Hits Different After 40
The transitions that tend to knock people's mental health sideways cluster in this decade of life and beyond: kids leaving the house, parents needing care, retirement (or the fear of it), a diagnosis, a divorce, a friend group that's quietly shrunk because nobody's organizing anything anymore. Purpose and structure get harder to come by right when you need them most.
That's part of why a coached training environment tends to do more than the workout on paper suggests. You've got a standing appointment. You've got people who notice if you don't show up. You've got a place where getting stronger is the explicit goal, out loud, which is rarer than it should be for adults past 40.
We'll go further into that specific idea — the cost of losing that structure, and who's most at risk when they do — next week.
What the Research Actually Suggests You Need
You don't need a perfect program. The Gordon meta-analysis found the effect held regardless of frequency, intensity, or duration. Consistency beat optimization.
You don't need to chase PRs for the mental health benefit. Strength gains weren't what predicted the mood improvement — showing up and doing the work was.
Structure and accountability aren't soft add-ons — they're the mechanism. A standing session with a coach and others who'll notice your absence is real psychological work, not just scheduling your week.
This complements care; it doesn't replace it. If you're managing depression or anxiety with a therapist or a doctor, training belongs alongside that — not instead of it.
A Client Story
I hear some version of this more than you'd think: "EXL did more for my mental health than anything else I've tried." It comes up often enough that I've stopped being surprised. But one story makes the point better than a stat ever could.
A couple I'll call Jeff and Shannon started training together a few years ago. Nothing dramatic at first — they showed up, we built their program, and later added nutrition coaching once the training became routine. Their bodies changed, and that mattered to them. But it's not what they talked about afterward. What they told me was that it saved their marriage. Not because of how they looked. Because for the first time in years they had something that belonged only to them — a shared goal, a standing block of time each week that had nothing to do with the kids, the job, or whatever was on fire that day. They had to show up for each other again, instead of just surviving the day next to each other.
That's the pattern I've watched play out for over a decade, not the exception. When COVID hit, and everything else shut down, we kept our small-group program running and moved what we couldn't run in person online, because I already knew what happens to people when that structure disappears. Here's the truth of it, plainly: the gym doesn't get moody. It doesn't have a bad day and take it out on you. It doesn't lie to you about whether you did the work — you put in the effort, you get the result, every time. For a lot of people, that's the most predictable relationship in their life. During a stretch when almost nothing else was steady, that predictability is what kept people connected instead of isolated.
The Bottom Line
The research on strength training and mental health is more solid than most people realize, and more honest than the "endorphins" version you've heard before: a real, moderate reduction in depressive symptoms across over 30 controlled trials, driven less by how much muscle you build and more by the structure, mastery, and consistency that training forces into your week. It's not a cure. It's not therapy. It's a real tool, and it belongs in the conversation about mental health right alongside the physical one.
References
Gordon, B. R., McDowell, C. P., Hallgren, M., Meyer, J. D., Lyons, M., & Herring, M. P. (2018). Association of Efficacy of Resistance Exercise Training With Depressive Symptoms: Meta-analysis and Meta-regression Analysis of Randomized Clinical Trials. JAMA Psychiatry, 75(6), 566–576.
Frontiers in Psychology (2024). Psychological needs, self-efficacy, motivation, and resistance training outcomes in a 16-week barbell training program for adults.
American Psychiatric Association (2024). "How Running and Resistance Training Can Help Depression and Anxiety."
Yu, J., Cheng, T., Guo, H., et al. (2026). Exercise-induced increases in skeletal muscle-derived apelin enhance hippocampal plasticity via apelin/APJ signaling. Molecular Psychiatry (mouse study; human validation pending).
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Mat Gover, BS, CSCS, is the owner and head coach of EXL Fitness & Performance in Orem, Utah. With nearly 30 years of coaching experience and a specialization in strength and performance for adults over 40, Mat brings science-backed training and a no-fluff approach to every session. When he's not coaching, he's skiing the Wasatch, mountain biking the Uintas, or out in the red rock around the San Rafael Swell.
