Does Working Out Raise Testosterone?

Working out does raise testosterone, but the spike is temporary and the size of the effect depends heavily on what kind of exercise you do, how hard you push, and how much recovery you get afterward. A bout of heavy resistance exercise can push testosterone levels up within minutes of finishing your last set, and the elevation generally lasts somewhere between 15 and 60 minutes before returning to baseline. The longer-term picture is more complicated, though, because certain training habits can actually suppress testosterone rather than boost it.

The Immediate Spike After Lifting Weights

The most reliable way to get a measurable testosterone increase from exercise is heavy resistance training. When you perform compound lifts like squats or deadlifts using loads heavy enough to challenge you, testosterone secretion ramps up during and immediately after the session.¹ This is an acute response, meaning it happens in the moment and fades relatively quickly. Blood draws taken immediately after a heavy squat protocol, then again at 5, 15, and 30 minutes post-exercise, show that both total and free testosterone peak right at the end of the workout and taper off over the next half hour.²

The size of the spike varies by training style. In one study comparing hypertrophy-style training and strongman-style training, the hypertrophy group saw testosterone jump roughly 136% above baseline immediately post-exercise, while the strongman and mixed groups saw increases of about 74% and 54% respectively.³ Those are large percentage increases, but they represent a brief hormonal wave, not a permanent shift. Within 30 to 60 minutes, levels drift back toward where they started.

Rest intervals between sets also matter. Shorter rest periods of about 60 seconds during both hypertrophy and strength protocols produce a more pronounced testosterone response than longer rest periods of 90 seconds, even when the total amount of work performed is the same.⁴ The metabolic stress of keeping rest short seems to amplify the hormonal signal.

Why the Spike Might Not Mean What You Think

Part of the post-exercise testosterone bump comes from changes in blood volume rather than a dramatic increase in hormone production. During intense exercise, plasma volume decreases as fluid shifts out of the bloodstream. This concentrates everything in the blood, including the proteins that carry testosterone. In older men, for instance, exercise increased total serum testosterone by about 39%, but a carrier protein called sex hormone-binding globulin (SHBG) rose by 19% at the same time, and the two were positively correlated.⁵ When SHBG goes up, it binds more testosterone, meaning less of it is “free” and biologically active.

Research on runners found a similar pattern. Total testosterone and SHBG moved together during exercise, but the biologically active fractions, free testosterone and non-SHBG-bound testosterone, rose during exercise and dropped back to baseline during recovery. The body appears to have a compensatory mechanism that keeps the usable portion of testosterone relatively stable even when total levels swing.⁶ So a headline number showing testosterone “surging” after a workout can be misleading if most of that surge is bound up and unavailable to tissues.

Endurance Training Tells a Different Story

If heavy lifting reliably bumps testosterone up in the short term, prolonged endurance exercise often does the opposite over time. A six-month endurance training program in which men built up to an average of about 56 kilometers of running per week led to significant decreases in both total testosterone and the free androgen index.⁷ The decline happened without a corresponding change in the brain signals that normally regulate testosterone production, suggesting that the testes themselves became less responsive under sustained endurance stress.

Even a single long run shows a revealing hormonal timeline. During a run lasting roughly 85 minutes, total testosterone rose and stayed elevated for the first 30 minutes of recovery. But by 90 minutes post-exercise, both total and free testosterone had dropped below pre-exercise levels. A day later, testosterone was still significantly suppressed.⁸ The initial bump was real, but the extended aftermath pushed things in the wrong direction. Cortisol, a stress hormone with catabolic effects, followed a similar pattern of initial rise and slow normalization, but it cleared faster than the testosterone suppression resolved.

This does not mean running or cycling is “bad for testosterone.” Moderate amounts of cardio are perfectly compatible with healthy hormone levels. The concern is with high-volume endurance training sustained over months, particularly when combined with insufficient calorie intake.

What About HIIT?

High-intensity interval training occupies a middle ground that people often ask about. A study of male masters athletes (men over 40 with training backgrounds) found that six weeks of sprint-interval training on a cycle ergometer produced a small but statistically borderline increase in free testosterone, from about 7.0 to 7.5 ng/dL, while total testosterone did not change significantly.⁹ HIIT sessions are short and intense enough to trigger an acute hormonal response without the prolonged cortisol elevation that comes with long endurance bouts, which may explain why the effect on free testosterone was modestly positive. But the magnitude was small, and total testosterone barely budged. If you are choosing HIIT specifically to raise testosterone, the evidence suggests the effect is real but not dramatic.

Does Long-Term Training Change Your Baseline?

The acute spike fades quickly, so the more important question is whether months or years of consistent training shift your resting testosterone level. The answer here is less clear-cut. In younger men, a resistance training program over 10 weeks increased resting free testosterone levels.¹⁰ Older men in the same study did not see the same resting increase, though they did mount a larger acute testosterone response to exercise after training than they did before, suggesting some adaptation of the hormonal system.

A year-long weightlifting study offers a useful window into how the body adapts. When lifters were deliberately pushed into a brief overreaching period (a sudden spike in training volume), their exercise-induced testosterone response was blunted during the first year. But after a full year of training experience, the same overreaching protocol actually produced an augmented testosterone response, and resting testosterone was better protected.¹¹ The endocrine system, in other words, became more resilient to training stress with experience. This is a reassuring finding for anyone worried that hard training will chronically suppress their hormones.

When Exercise Lowers Testosterone

There is a real condition in which exercise chronically depresses testosterone, and it is more common than most gym-goers realize. When training volume is high and calorie intake does not keep up, the body enters a state of low energy availability. In men, this can suppress the hormonal axis that drives testosterone production. Researchers have identified two patterns: a transient suppression linked to overtraining or underfueling that resolves with rest and better nutrition, and a more persistent form called the Exercise Hypogonadal Male Condition, in which chronically low testosterone can last for years.¹²

A case study of a 20-year-old collegiate swimmer illustrates the acute version. He presented with strikingly low total, free, and bioavailable testosterone, despite being young and highly active. The cause was relative energy deficiency in sport (RED-S), essentially burning far more calories than he was eating. Once he increased his nutrition and reduced his training load slightly, his testosterone gradually returned to normal.¹³ The lesson is that the exercise itself was not the villain; the mismatch between energy expenditure and energy intake was.

Age Changes the Equation

Younger men get a bigger hormonal bang for their workout buck. When researchers compared the acute testosterone response to heavy resistance exercise in men around age 30 versus men around age 62, the younger group showed a significantly greater rise in both total and free testosterone across the entire 30-minute post-exercise recovery window.¹⁴ The most striking gap was in free testosterone, the form that actually enters cells and does the work. Older men still mounted a response, just a smaller one.

This does not mean resistance training is pointless for older adults from a hormonal standpoint. As noted in the long-term training data, older men who trained over 10 weeks showed increased exercise-induced total testosterone compared to their untrained baseline. They did not get the resting free testosterone boost the younger men did, but they did improve their responsiveness. And the broader benefits of resistance training for older adults, including preserved muscle mass, bone density, and metabolic health, are not in question.

Women See a Response Too

Women produce far less testosterone than men, but they still show a measurable hormonal response to resistance exercise. In young healthy women, an acute heavy resistance exercise session increased total testosterone and free testosterone by roughly 25% each.¹⁵ The absolute numbers involved are much smaller than in men, but the percentage jump is comparable. Interestingly, body composition influenced the resting levels: markers of higher body fat correlated with higher testosterone concentrations in these women, a reminder that fat tissue plays a role in hormone metabolism regardless of sex.

The competitive context matters for women as well. In studies of female soccer and badminton players, testosterone rose after victories and dropped after defeats, mirroring patterns seen in men.¹⁶ ¹⁷ The biological machinery linking competition, social dominance cues, and testosterone release appears to work similarly across sexes, just at different magnitudes.

How Androgen Receptors Complicate the Picture

Even if exercise raises circulating testosterone, the hormone only matters if it gets into cells and activates the androgen receptor. This is where sex differences go beyond just the amount of testosterone floating around. After resistance exercise training, the androgen receptor in skeletal muscle moved into the cell nucleus (where it switches genes on) significantly more in men than in women. And the men who gained the most muscle from training were the ones with the greatest increase in nuclear androgen receptor content.¹⁸ So even if you could equalize testosterone levels between a man and a woman, the downstream receptor machinery would still favor a larger muscle-building response in men.

Time of Day and the Hormonal Environment

Testosterone follows a circadian rhythm, peaking in the early morning and dipping in the evening. This creates a natural question: does it matter when you train? A study of weight-trained men who performed identical heavy resistance sessions at 6:00 AM and 6:00 PM found that evening training produced a more favorable hormonal environment. Pre-exercise cortisol was significantly lower in the evening, which kept the testosterone-to-cortisol ratio higher throughout the session, a profile generally considered more supportive of muscle growth.¹⁹

However, a longer-term training study found that 24 weeks of combined strength and endurance training did not alter the underlying circadian rhythm of testosterone or cortisol regardless of whether people trained in the morning or evening.²⁰ The daily rhythm stayed intact. So while a single evening session may give you a slightly better acute hormonal profile, training consistently at any time of day does not appear to permanently shift your hormonal landscape in one direction or another. Train when you can train consistently.

What You Eat Matters More Than You Might Expect

Diet can either support or undermine the testosterone response to training. A systematic review and meta-analysis found that low-carbohydrate diets with moderate protein had no consistent effect on resting testosterone, but low-carbohydrate diets combined with high protein intake (above about 35% of calories from protein) significantly decreased both resting and post-exercise total testosterone.²¹ This is worth flagging because high-protein, low-carb diets are extremely popular in gym culture, and many people adopt them specifically to optimize their hormones.

Carbohydrate intake also affects the free testosterone-to-cortisol ratio, which researchers use as a rough gauge of how anabolic or catabolic your body is. During three days of intensive exercise, men on a low-carb diet saw their free testosterone-to-cortisol ratio plummet by about 43%, while men on a higher-carb diet saw virtually no change.²² The takeaway is not that you need to eat a carb-heavy diet, but that fueling your training adequately is a prerequisite for maintaining a healthy hormonal response. Undereating carbs during periods of hard training can sabotage the hormonal benefits you are trying to get from the exercise itself.

Body Fat, Weight Loss, and Testosterone

For men carrying significant excess body fat, weight loss may do more for testosterone levels than any specific exercise protocol. Fat tissue contains the enzyme aromatase, which converts testosterone into estrogen. The more body fat you carry, the more active this conversion becomes, pulling testosterone levels down. A review of the relationship between body mass index and testosterone confirmed that diet, exercise, and surgical weight loss all have the potential to restore hormonal balance in men with obesity, driven by improvements in insulin sensitivity, reduced inflammation, and lower aromatase activity.²³

A clinical trial in obese men with low testosterone found that weight loss alone (in the placebo group) kept total testosterone relatively flat at around 290 to 300 ng/dL over six months. When weight loss was combined with an aromatase inhibitor that blocked the fat-tissue conversion of testosterone to estrogen, total testosterone climbed to about 530 to 540 ng/dL.²⁴ The drug is not the point here for most people; the point is that excess body fat actively suppresses testosterone, and exercise that leads to fat loss addresses one of the biggest modifiable drivers of low testosterone in men who are overweight.

Competition and Psychology Play a Role

The testosterone response to exercise is not purely mechanical. Competing against another person adds a layer on top of the physical stimulus. Before competitive events, testosterone tends to rise in anticipation, and after the event, it rises further in winners and drops in losers.²⁵ What makes this interesting is that the hormonal response was linked more to psychological factors like motivation to win and self-efficacy than to the physical exertion itself. Two people doing the same workout at the same intensity will not necessarily produce the same testosterone response if one is competing and the other is just going through the motions.

Sleep as the Silent Variable

Recovery between workouts may matter as much as the workouts themselves when it comes to testosterone. A single night of sleep deprivation decreased plasma testosterone by about 24% while simultaneously increasing cortisol by about 21%.²⁶ That is a substantial shift from just one bad night. If you are training hard but sleeping poorly, the hormonal environment your muscles sit in during recovery is meaningfully worse than it would be with adequate sleep. The testosterone-raising effect of a great workout can be partially or fully erased by the testosterone-lowering effect of a bad night’s rest. For anyone trying to optimize their hormone profile through exercise, sleep is not optional infrastructure; it is a load-bearing wall.

The Testosterone-to-Cortisol Ratio in Monitoring

Sports scientists and coaches increasingly track the ratio of testosterone to cortisol rather than testosterone alone. The idea is that the balance between your primary anabolic hormone and your primary catabolic stress hormone tells you more about your body’s readiness to build or break down tissue than either number in isolation.²⁷ A dropping ratio over weeks of training can signal that you are accumulating more stress than you are recovering from, even if neither hormone alone looks alarming.

This ratio is responsive to acute exercise, chronic training load, competition demands, and recovery status, but it fluctuates with time of day, individual variability, and what you ate, which makes any single measurement hard to interpret.²⁸ Its real value appears in trends measured over weeks and months, ideally alongside other markers like training volume, subjective fatigue ratings, and performance metrics. Treating any single post-workout testosterone reading as meaningful is like checking your bank balance once and concluding you are rich or broke. The trajectory matters far more than the snapshot.