Exercise Is the Best Antidepressant — But Only If Your T Is There

Galloway and Huberman are right about resistance training and mood. Here's the hormonal mechanism they left out.

What Galloway Actually Said, and What He Got Right

Galloway is correct, and the evidence behind him is stronger than most people realize. On the April 27, 2026 Huberman Lab episode, he put it plainly: "The best antidepressant is moving weights, building some bulk, or running far… work out at least three times a week." That recommendation holds up under clinical scrutiny.

The landmark study here is Blumenthal et al., *JAMA Internal Medicine*, 1999, a 16-week RCT that assigned men and women with major depressive disorder to aerobic exercise, sertraline, or both. Remission rates across groups landed near 60%. Exercise matched the drug. That finding has since been replicated and extended to resistance training: a Gordon et al., *JAMA Psychiatry*, 2018 meta-analysis of 33 RCTs found that lifting reduced depressive symptoms regardless of health status, training frequency, or intensity. The effect held in healthy adults, clinical populations, and everyone in between.

Galloway's prescription is not bro wisdom dressed up as advice. It reflects a real, reproducible signal in the literature:

• ▶Aerobic exercise matches antidepressant medication for mild-to-moderate depression in head-to-head RCTs
• ▶Resistance training reduces depressive symptoms across diverse populations with no minimum effective dose identified
• ▶Three sessions per week appears sufficient; more is not clearly better for mood outcomes

What neither Galloway nor the Huberman episode addressed is the biological mechanism underneath that signal, and what happens when that mechanism is compromised before a man ever touches a barbell.

The Mechanism Galloway Skipped: What Resistance Training Does to Testosterone

Resistance training raises testosterone acutely by 15–25% in the hour following a hard session and, over weeks of consistent training, suppresses resting cortisol by 10–20%. That shift in the testosterone-to-cortisol ratio is the likely biological substrate for the mood benefit Galloway describes. The barbells aren't the antidepressant. The hormonal signal they generate is.

The Acute Spike: What Happens in the Hour After a Hard Lift

Within minutes of finishing a compound-lift session, your hypothalamic-pituitary-gonadal (HPG) axis responds. The hypothalamus increases its gonadotropin-releasing hormone pulse, luteinizing hormone (LH) rises, and the testes release testosterone into circulation. Kraemer et al., *Journal of Applied Physiology*, 1991 documented acute testosterone elevations of 15–25% in trained men following high-volume resistance exercise. That spike is what you feel as the post-workout clarity and confidence that outlasts the pump by an hour or two.

Exercise selection matters. Raastad et al., *European Journal of Applied Physiology*, 2000 found that high-volume compound lifts, specifically squats and deadlifts, produce a substantially larger acute testosterone response than isolation work. The larger the muscle mass recruited and the higher the metabolic demand, the stronger the hormonal signal.

Put differently: the mood lift from lifting is partly neurological and partly endocrine. Skipping compound movements and sticking to machines leaves a significant share of that signal on the table.

The Chronic Shift: Why the T-to-Cortisol Ratio Is the Real Mood Lever

The acute spike matters, but the chronic adaptation matters more. Over 12 weeks of consistent resistance training, resting cortisol drops 10–20%, according to Hackney et al., *Sports Medicine*, 2020. Testosterone holds steady or rises. That widening gap between the two is measurable on a lab panel and felt as resilience: less reactive to stress, faster emotional recovery, flatter baseline anxiety.

Mehta & Josephs, *Hormones and Behavior*, 2010 identified the testosterone-to-cortisol ratio as a reliable predictor of dominance motivation and competitive drive in men, independent of testosterone alone. The practical takeaway:

• ▶High T, high cortisol: wired but irritable, hard to switch off
• ▶Low T, high cortisol: flat affect, low motivation, poor stress tolerance
• ▶High T, low cortisol: what three workouts a week, done consistently, is actually building toward

This is where Galloway's prescription is correct and incomplete at the same time. Three workouts a week will move this ratio in the right direction for most men. For men whose baseline testosterone is already low, the androgen receptor signaling that mediates exercise-induced neuroplasticity may be too blunted to respond the way the research predicts. That's a clinical problem that TRT addresses, not a training problem that more volume solves.

Before you can know which category you're in, you need a number, and that starts with a baseline lab panel.

Why Exercise Alone Fails Men With Low Baseline Testosterone

For men with clinically low testosterone, resistance training still helps, but the hormonal machinery that converts exercise stress into mood improvement is running on a depleted fuel supply. The androgen receptor signaling that drives exercise-induced neuroplasticity requires adequate testosterone to function. Without it, the ceiling on exercise's antidepressant effect is lower than most clinicians acknowledge.

Androgen Receptors and Neuroplasticity: The Signaling Problem

Here is the mechanism Galloway's framing skips: exercise raises mood largely by upregulating brain-derived neurotrophic factor (BDNF), a protein that promotes the growth and maintenance of neurons in the hippocampus, the brain region most implicated in depression. Testosterone potentiates that BDNF response. Bhatt et al., *Psychoneuroendocrinology*, 2021 showed that testosterone amplifies BDNF expression in hippocampal tissue, and that low testosterone blunts the BDNF upregulation that exercise would otherwise produce.

Put differently: exercise pulls the lever, but testosterone determines how far the lever travels.

Androgen receptors are expressed throughout the brain, including in the hippocampus and prefrontal cortex. When free testosterone is low, those receptors sit underoccupied. The downstream signaling cascade that produces neuroplasticity and, eventually, mood improvement runs at reduced amplitude. A man with a total testosterone of 260 ng/dL doing three workouts a week is not getting the same neurological return on that effort as a man at 650 ng/dL doing the same program.

The Hypogonadal Floor: When the Dial Has Nowhere to Turn

The depression-hypogonadism overlap is larger than most men realize. Zarrouf et al., *Journal of Psychiatric Practice*, 2009 found that men with total testosterone below 300 ng/dL had two to three times higher rates of clinical depression compared to eugonadal men. A separate analysis by Shores et al., *American Journal of Geriatric Psychiatry*, 2004 estimated that roughly 38% of men with depression have comorbid hypogonadism, a rate that rarely gets screened for in standard psychiatric or primary care workups.

This matters clinically because the treatment implications differ:

• ▶Total T above 400 ng/dL: Exercise is likely to produce meaningful mood benefit; the androgen receptor signaling is functional enough to support BDNF upregulation.
• ▶Total T 300–400 ng/dL: Exercise helps, but the response is attenuated; lifestyle optimization (sleep, protein, Zone 2 cardio) may move the dial, but the ceiling is lower.
• ▶Total T below 300 ng/dL: Exercise is necessary but insufficient for most men. Androgen receptor occupancy is too low for exercise-induced neuroplasticity to operate at full capacity. This is where TRT and exercise become synergistic than redundant.

Bhasin et al., *NEJM*, 2001 demonstrated this in a dose-response study: mood and energy improvements tracked with androgen receptor occupancy, not with effort or intent. Men who trained hard but had suppressed testosterone did not close the gap on men with adequate testosterone who trained at the same volume.

The practical implication is one that many men spend years learning the hard way: you can add a fourth workout, clean up your diet, and still feel flat, not because you lack discipline, but because you are trying to run a complex neurochemical process on insufficient substrate.

That substrate has a number, and it shows up on a lab panel.

TRT + Exercise: Synergistic, Not Redundant

TRT and resistance training work through different biological pathways, which means combining them produces outcomes neither achieves alone. The mood benefit, the lean mass gain, the recovery, all of it compounds when both variables are addressed simultaneously. For hypogonadal men, this isn't a nice-to-have. It's the difference between a protocol that works and one that doesn't.

What the Research Shows on Combined TRT and Resistance Training

The landmark evidence here is Bhasin et al., *NEJM*, 1996. In a randomized controlled trial, men assigned to testosterone plus resistance training gained 6.1 kg of lean mass over 10 weeks. The exercise-only group gained 1.9 kg. The testosterone-only group gained 3.2 kg. The combined group didn't just split the difference; it outperformed the sum of the individual effects.

The mood data follows the same pattern. Shores et al., *Journal of Clinical Psychiatry*, 2009 found that hypogonadal men with depression who received testosterone therapy showed significantly greater improvement in depressive symptoms than those receiving placebo, and that response was amplified in men who maintained structured physical activity. The exercise opens the door; testosterone determines whether anyone walks through it.

The mechanism is androgen receptor density. Resistance training upregulates androgen receptors in skeletal muscle and neural tissue. More receptors mean more signal transduction per unit of testosterone, which means the same TRT dose produces a stronger anabolic and neurological response in a man who is training than in one who isn't.

Source: [Bhasin et al., NEJM, 1996](https://pubmed.ncbi.nlm.nih.gov/?term=Bhasin+testosterone+exercise+1996)

PMM Clinical Observation: What We See When Men Add Structure to Their Protocol

The trial data aligns with what Dr. Egbert observes in practice. "The men who come in already training, even if they've been spinning their wheels for a year, respond faster on TRT than men who are sedentary," he says. "Within 30 to 45 days, the mood shift is noticeable. By 60 days, they're asking me why they waited so long."

That timeline matches a case we followed recently. A 44-year-old patient presented with a total testosterone of 298 ng/dL and a PHQ-9 score of 11, indicating moderate depression. He had been training four days per week for 18 months with no meaningful improvement in mood. His body composition had stalled, his motivation was flat, and he'd declined an SSRI twice because he didn't want to feel blunted.

Twelve weeks after initiating testosterone cypionate at 100 mg per week, with his existing training program unchanged, his PHQ-9 dropped to 4. Lean mass increased by 4.2 kg. He described the change not as feeling medicated, but as feeling like himself again, the training finally doing what he'd always expected it to do.

This is the pattern: men who have been doing everything right and getting diminishing returns aren't failing at fitness. They're running a program that requires a hormonal substrate they don't have. The training was always the right input. The testosterone is what lets the body act on it.

The question most men ask at this point is how to know whether their baseline is low enough to warrant intervention, and that answer lives in a single lab panel.

The Practical Protocol: How to Structure Exercise for Maximum Hormonal Benefit

Three resistance sessions per week, built around compound lifts in the 6–10 rep range at 75–85% of your one-rep max (1RM), with 60–90 second rest intervals between sets. That is the specific structure that maximizes the acute testosterone spike from training. Galloway got the frequency right. The mechanics matter too.

Kraemer & Ratamess, *Sports Medicine*, 2005 established this after decades of resistance training research. Multi-joint compound movements recruit more total muscle mass, which drives a larger hormonal response than isolation work. High-rep pump sets train the muscle but leave the hormonal signal on the table.

The session structure the research supports:

• ▶Exercises: Compound, multi-joint lifts: squat, deadlift, bench press, row, overhead press
• ▶Intensity: 75–85% of 1RM
• ▶Volume: At least 3 sets per exercise
• ▶Rest intervals: 60–90 seconds between sets
• ▶Frequency: 3–4 sessions per week; beyond 4, cortisol blunting begins to offset the hormonal gain

For running, the hormonal calculus shifts. Zone 2 cardio, aerobic work below 75% of maximum heart rate (HRmax), preserves testosterone and improves insulin sensitivity without driving cortisol high enough to suppress the HPG axis. Hackney, *Current Sports Medicine Reports*, 2020 found that chronic high-volume endurance training exceeding 60 minutes per day suppresses testosterone through sustained cortisol elevation. A 30-minute Zone 2 run is a hormonal asset; daily 90-minute long runs stacked on top of three lifting sessions is a liability.

The variable most men overlook is sleep. Leproult & Van Cauter, *JAMA*, 2011 showed that one week of five-hour sleep nights reduced testosterone by 10–15% in healthy young men, roughly a decade of normal hormonal aging compressed into seven days. Your training session is the stimulus; sleep is when the pituitary responds to that stimulus and drives the hormonal adaptation. Skip the sleep and you are lifting for cardiovascular health alone.

Put differently: you can optimize every variable in the gym and still cap your hormonal ceiling if cortisol is chronically elevated or sleep is chronically short.

Men who execute this protocol correctly and still plateau, training consistently, sleeping well, keeping cardio in Zone 2, are often the men whose baseline testosterone was too low to generate a meaningful response in the first place. That's exactly where the Free Hormone and Metabolism Quiz becomes the relevant diagnostic starting point.

How to Know If Exercise Alone Is Enough, Or If You Need to Check Your Labs

If you've been training three or more days per week for at least eight weeks and still feel flat, low motivation, poor recovery, mood that doesn't track your effort, your baseline testosterone is the first thing to rule out. Exercise works through androgen receptor signaling; if the hormone isn't there, the signal is weak regardless of how hard you train.

The Aging Male Symptoms (AMS) scale is a validated 17-item questionnaire used clinically to screen for hypogonadism. A score of 37 or higher correlates with confirmed low testosterone in 70–80% of cases. You don't need a physician to take it; it's a starting point for deciding whether labs are warranted.

The symptoms that most reliably suggest your mood-exercise response is blunted by low T, than by training variables:

• ▶Morning motivation that hasn't improved despite consistent sleep and training
• ▶Libido that's flat or inconsistent week to week
• ▶Gym performance plateaued for more than six weeks with no obvious programming reason
• ▶Mood lift after workouts that lasts hours, not days
• ▶Body composition not responding to effort, with fat holding at the midsection despite caloric discipline

If three or more of those apply, the next step is a lab panel that includes total testosterone, free testosterone, luteinizing hormone (LH), and sex hormone-binding globulin (SHBG). Total testosterone alone misses too much context. SHBG binds free testosterone and renders it inactive, which means a total T of 450 ng/dL can still leave a man functionally low if SHBG is elevated.

PMM's Foundation panel covers all four markers for $49. The Primal Health Playbook report that accompanies every panel uses functional optimal ranges, 600–900 ng/dL for total testosterone, than the standard lab floor of 300 ng/dL, which is where "normal" ends and "not diagnosably broken" begins. Those are not the same thing, and Dr. Egbert built the panel specifically to close that gap.

What the labs show determines whether you're optimizing a system that's working, or pushing against a hormonal ceiling that exercise alone cannot raise.

The Bottom Line: Galloway Is Right, and There's More to the Story

Resistance training is the best antidepressant most men aren't taking seriously enough. Gordon et al., *JAMA Psychiatry*, 2018 confirmed this across every health category: the effect is real, replicable, and clinically meaningful. The mechanism runs through testosterone, and if your testosterone is low, you're working with a broken amplifier.

The clinical hierarchy is straightforward:

• ▶Start with resistance training, three sessions per week minimum. This is non-negotiable regardless of where your labs land.
• ▶If mood response is blunted after 8–12 weeks of consistent training, get your levels checked. Men below 400 ng/dL with active mood symptoms are unlikely to get the full neuroplasticity benefit from exercise alone; androgen receptor signaling doesn't fire the way it should at that baseline.
• ▶If labs confirm hypogonadism, TRT and resistance training together produce what neither does alone: the hormonal substrate and the stimulus, working in the same direction.

Galloway's prescription is correct. The question is whether your biology can execute it. The $49 Foundation panel tells you where you actually stand, or take the quiz if you want to start with symptoms first.

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