Squats produce a short-lived spike in testosterone that peaks within minutes of finishing a heavy set and fades back to baseline within about half an hour. This acute bump is real and measurable, but it does not translate into a lasting change in your resting testosterone levels. A 2022 meta-analysis of exercise training studies found essentially zero long-term effect on baseline testosterone in previously inactive men, which complicates the popular gym narrative considerably. The story gets more interesting when you look at what squats actually do to the machinery inside muscle cells, and at why the temporary hormone spike may matter less than people think.
The Post-Squat Testosterone Spike
When you finish a demanding set of barbell squats, your blood testosterone concentration rises. This has been documented repeatedly across decades of exercise physiology research. The effect is most consistent in men performing heavy compound lifts, and testosterone is one of several hormones that respond, alongside growth hormone and cortisol.1PubMed. Testosterone physiology in resistance exercise and training: the up-stream regulatory elements The increase typically shows up in blood draws taken immediately after exercise and at the 15-minute mark, and it tends to return to pre-exercise levels within 30 to 60 minutes.
Not every study finds the same magnitude of response, and a few recent investigations have challenged how consistent the spike really is. One 2023 study that measured a broad panel of steroid hormones in both blood and muscle tissue found that only cortisol rose meaningfully after a high-volume resistance protocol, with no significant changes in testosterone or other steroids in either compartment.2Frontiers in Endocrinology. Acute changes in serum and skeletal muscle steroids in resistance-trained men That result sits in tension with the older consensus, and it suggests that the hormonal picture is more variable than a clean “squats boost testosterone” headline would imply.
Why Squats Tend to Outperform Other Exercises
When researchers compare exercises head to head, squats consistently produce a larger hormonal response than movements that use less muscle. Protocols that stress a large amount of muscle mass, use moderate-to-high intensity, keep rest intervals relatively short, and accumulate substantial training volume tend to drive the biggest acute hormonal elevations.3PubMed. Hormonal responses and adaptations to resistance exercise and training Squats check all of those boxes. They load the glutes, quadriceps, hamstrings, spinal erectors, and core simultaneously, which is a lot of tissue under tension at once.
The free-weight aspect matters too. A study comparing barbell squats to the leg press, which targets similar muscles through a similar range of motion, found that the squat produced a higher testosterone response and a dramatically higher growth hormone response immediately after exercise.4PubMed. The acute hormonal response to free weight and machine weight resistance exercise The likely explanation is that free-weight squats demand more stabilizer recruitment and overall neuromuscular effort, which amplifies the systemic stress signal that drives hormone release.
How Training Variables Shape the Response
The way you structure your squat workout changes how much testosterone you release. Volume appears to be the single most influential variable. A study comparing hypertrophy-style training (higher reps, moderate loads) with power and maximal-strength schemes found that only the hypertrophy protocol produced meaningful increases in salivary testosterone and cortisol, and the researchers concluded that total load volume was the primary driver of the endocrine response.5The Journal of Strength & Conditioning Research. The Salivary Testosterone and Cortisol Response to Three Loading Schemes In practical terms, doing more total work moves the hormonal needle more than lifting heavier for fewer reps.
A separate experiment looking specifically at barbell squats confirmed this pattern. Performing six or twelve sets of squats produced notable hormonal responses, while three sets of three repetitions did not produce significant post-exercise increases in testosterone, reinforcing the idea that very low volumes simply do not generate enough metabolic stress to trigger a hormonal response.6PubMed. Endocrine response to high intensity barbell squats performed with constant movement tempo and variable training volume
Rest intervals add a layer of complexity. Shorter rest periods between sets tend to amplify the acute testosterone bump. One study found that both 60-second and 90-second rest intervals during hypertrophy protocols produced significant increases in total testosterone immediately post-exercise and at the 15-minute mark.7PubMed Central. Influence of rest interval length on acute testosterone and cortisol responses to volume-load-equated total body hypertrophic and strength protocols But the picture is not perfectly consistent. Another study found that 120-second rest intervals actually produced a higher serum testosterone response than 60-second intervals, possibly because the slightly longer rest allowed trainees to maintain higher-quality effort across sets.8The Journal of Strength & Conditioning Research. Effects of Very Short Rest Periods on Hormonal Responses to Resistance Exercise in Men There is probably a sweet spot somewhere in the 60-to-120-second range, but the honest answer is that individual responses vary and the research has not converged on a single prescription.
One underappreciated finding is that these hormonal differences between rest intervals tend to fade with training experience. A study tracking men over ten weeks of strength training found that short rest intervals (one minute) produced greater post-exercise testosterone than long rest intervals (two and a half minutes) during the first week of training, but the difference had vanished by week five and was completely absent by week ten. The researchers also noted that the hormonal response was not predictive of strength or lean tissue gains over the training period.9The Journal of Strength & Conditioning Research. The Effect of Resistive Exercise Rest Interval on Hormonal Response, Strength, and Hypertrophy With Training
The Resting Testosterone Question
Here is where the popular narrative falls apart. The acute spike that follows a squat session does not accumulate into a permanent elevation of your baseline testosterone. A systematic review and meta-analysis that pooled data across multiple exercise training studies in insufficiently active men found that exercise training had a negligible effect on resting total testosterone. The overall effect was essentially zero, and subgroup analyses showed this held regardless of training mode, age, body mass, or how testosterone was measured.10The Journal of Strength & Conditioning Research. Effects of Exercise Training on Resting Testosterone Concentrations in Insufficiently Active Men: A Systematic Review and Meta-Analysis
This is an important distinction that gets lost in fitness media. A temporary post-workout hormone bump is a transient metabolic event. Your resting testosterone, the level measured on a fasting morning blood draw days after your last workout, is governed by far more powerful regulators: sleep, body composition, stress, age, and the hypothalamic-pituitary-gonadal axis. Squats do not meaningfully alter that system’s set point. If a man has clinically low testosterone, squatting heavier will not fix it.
Does the Acute Spike Actually Build Muscle?
For years, the assumption was that the post-exercise testosterone surge directly stimulated muscle protein synthesis and drove hypertrophy. This idea shaped entire training philosophies, with coaches designing programs to “maximize the hormonal response.” More recent evidence has been unkind to that theory. A review of the relationship between hormones and muscle growth concluded that acute resistance-training-induced hormonal elevations do not appear to be directly correlated with muscle growth.11PubMed. The role of hormones in muscle hypertrophy
The spike is too brief and too small relative to your circulating baseline to act as a meaningful anabolic signal on its own. Muscle grows in response to mechanical tension, metabolic stress, and the local signaling cascades those stimuli trigger inside muscle fibers. The systemic hormonal wash that follows a hard set of squats is more of a byproduct of the stress than the cause of the adaptation. This does not mean testosterone is irrelevant to muscle building, because chronically higher testosterone absolutely supports greater muscle mass. It means the fleeting post-workout bump is not the mechanism through which squats make your muscles grow.
Androgen Receptors Tell a Different Story
While the circulating testosterone spike may be a red herring for muscle growth, something more interesting happens at the receptor level. Androgen receptors are the proteins inside muscle cells that bind testosterone and initiate the downstream gene expression that contributes to muscle repair and growth. Resistance exercise appears to change how many of these receptors your muscles express.
A study measuring androgen receptor messenger RNA in muscle found that it increased substantially after both concentric and eccentric loading, with the concentric protocol doubling receptor mRNA concentrations.12PubMed. Mechanical load increases muscle IGF-I and androgen receptor mRNA concentrations in humans Repeated bouts of resistance exercise amplified this effect further, with androgen receptor mRNA and protein increasing significantly after the second and third exercise sessions and correlating with testosterone levels.13PubMed. Effects of sequential bouts of resistance exercise on androgen receptor expression
The receptor response is not simple, though. A study comparing single-set to multi-set squat protocols found that higher-volume training actually decreased androgen receptor content by about 46% one hour after exercise, possibly because the greater catabolic stress temporarily broke down more receptor protein.14The Journal of Steroid Biochemistry and Molecular Biology. Androgen receptor content following heavy resistance exercise in men This suggests a pattern where heavy exercise initially depletes receptors and the body then upregulates them during recovery, potentially increasing the muscle’s sensitivity to whatever testosterone is circulating. In other words, squats may not meaningfully raise your testosterone, but they may make your muscle cells better at using the testosterone you already have.
How Age Affects the Response
Younger men produce a substantially larger testosterone response to heavy resistance exercise than older men. A study comparing men in their thirties to men in their sixties found that the younger group had significantly greater increases in both total and free testosterone across the entire post-exercise recovery period, with the difference in free testosterone being particularly striking.15PubMed. Acute hormonal responses to heavy resistance exercise in younger and older men A related study examining upper-body versus lower-body exercise confirmed that older men produced smaller testosterone increases overall, and that their total testosterone only rose significantly during lower-extremity exercise, whereas younger men showed increases across both upper and lower body protocols.16PubMed. Acute hormone responses to heavy resistance lower and upper extremity exercise in young versus old men
This does not mean squats are less beneficial for older adults. The muscle-building and bone-strengthening effects of squatting are well established across age groups. It simply means that older men should not expect the same hormonal signature from their training, and it reinforces the point that the acute testosterone spike is not the primary driver of the strength and muscle gains that resistance training delivers.
The Response in Women
Women also experience a post-exercise testosterone increase, though the absolute magnitudes are much smaller given that women’s circulating testosterone is a fraction of men’s. A study of young, healthy women found roughly a 25% increase in both total and free testosterone following a heavy resistance exercise protocol.17PubMed. Testosterone responses after resistance exercise in women: influence of regional fat distribution A study of resistance-trained men and women performing six sets of ten heavy squats confirmed that circulating total testosterone rose significantly in men, while free testosterone increased in both sexes.18PubMed. Effect of resistance exercise on muscle steroid receptor protein content in strength-trained men and women
Early-phase resistance training adaptations appear broadly similar between men and women in terms of fiber-type shifts and strength gains, even though only men showed a significant increase in resting testosterone after several weeks of training. One study found that men’s resting serum testosterone increased after four weeks of training, with no corresponding change in women.19PubMed. Skeletal muscle adaptations during early phase of heavy-resistance training in men and women Since women gain strength and muscle from resistance training despite having much lower testosterone and a smaller hormonal response, this is yet another piece of evidence that the acute testosterone spike is not the key mechanism behind training adaptations.
Cortisol Comes Along for the Ride
Testosterone never rises alone after squats. Cortisol, often framed as the “catabolic” counterpart, increases alongside it, sometimes even more dramatically. High-intensity squat protocols produce greater acute responses in both testosterone and cortisol compared to moderate-intensity work.20PubMed. Hormonal responses to high- and moderate-intensity strength exercise This matters because some fitness commentators fixate on the testosterone-to-cortisol ratio as a marker of anabolic versus catabolic balance, suggesting that if cortisol rises too much, it “cancels out” the testosterone benefit.
The reality is less dramatic. Cortisol helps mobilize energy substrates during intense effort and is a normal part of the stress-recovery cycle. Trained non-steroid-using lifters performing ten sets of back squats showed a significant post-exercise cortisol increase, while their testosterone did not change significantly.21PubMed. Resistance exercise effects on plasma cortisol, testosterone and creatine kinase activity in anabolic-androgenic steroid users Worrying about your cortisol-to-testosterone ratio after a single workout is not a productive use of mental energy. Both hormones fluctuate throughout the day and in response to sleep, meals, and psychological stress far more than they respond to any individual training session.
Training Experience and Neuromuscular Priming
Experienced athletes may actually get more out of acute hormonal responses than beginners, though not for the reasons usually cited. Research into short-term testosterone effects on the neuromuscular system suggests that trained athletes show a more pronounced rapid-pathway response, where circulating testosterone briefly enhances neural drive and force output. This pathway appears more prominent in athletes than non-athletes, possibly because repeated training sensitizes both the neuromuscular and endocrine systems to work together more efficiently.22PubMed. Two emerging concepts for elite athletes: the short-term effects of testosterone and cortisol on the neuromuscular system and the dose-response training role of these endogenous hormones
This is a subtler and more plausible role for the acute testosterone bump than the outdated “flood the muscles with anabolic hormone” model. Rather than building muscle directly, the transient hormonal surge might help experienced lifters recruit more motor units and produce more force in the short term, which could improve training quality within a session. For a beginner, neural adaptations are already happening so rapidly that this effect would be difficult to isolate.
Practical Implications for Your Training
If you are squatting primarily to raise your testosterone, you are solving the wrong problem. Squats are extraordinarily effective for building lower-body strength, increasing bone density, improving athletic performance, and developing functional movement capacity. They do cause a temporary testosterone spike, and that spike is slightly larger than what you would get from a leg press or a leg extension machine. But the spike does not last, and it does not appear to be the mechanism that makes squats effective for muscle growth.
What actually moves baseline testosterone in a meaningful, sustained way involves lifestyle factors that are less exciting than a heavy barbell: maintaining a healthy body-fat percentage, sleeping seven to nine hours consistently, managing chronic stress, and eating enough calories and dietary fat. For men with clinically low testosterone, medical evaluation and potential hormone replacement therapy are the evidence-based paths forward, not squat programming.
None of this diminishes the value of squatting. It just means the value comes from mechanical loading, metabolic stress, and the local signaling cascades those trigger inside your muscles, including the upregulation of androgen receptors that may amplify how effectively your cells respond to the testosterone already in your bloodstream. That is a quieter, less marketable story than “squats boost your T,” but it is the one the evidence supports.
Supplements and Testosterone Boosters
The same audience searching for squat-testosterone connections often encounters supplements marketed as “natural testosterone boosters,” sometimes explicitly tied to resistance training. Ingredients like tribulus terrestris, fenugreek, D-aspartic acid, and ashwagandha populate this market. Some of these compounds have shown modest effects on testosterone or related markers in individual trials, but the effects are generally small, inconsistent across studies, and nowhere near the magnitude of what pharmaceutical testosterone replacement delivers. If the post-squat hormonal spike is too brief to meaningfully affect muscle growth, a supplement nudging your resting levels up by a few percentage points is unlikely to produce visible physique changes either. The supplements that reliably support training outcomes, like creatine monohydrate, work through entirely different mechanisms that have nothing to do with testosterone signaling.