Can calisthenics and lifestyle hacks actually raise your testosterone?

What did @lauryn.kassey actually say?

The creator opens with a relatable hook: if someone else is still sleeping while you're up, "that might be low testosterone." From there, she lists classic low-T symptoms, including low libido, low energy, more fat, and less muscle. Her main claim is actionable: "lift weights" is step one, and "four weeks of training can boost testosterone by around 40%." She frames this as just one of eight natural methods.

To be fair, she's not selling anything in this clip and she's not diagnosing anyone. The tone is casual and aspirational, aimed at a gym-going audience. But that 40% figure is specific enough to deserve scrutiny, and the framing around symptoms is looser than it should be.

Does the science back this up?

Partially, but the 40% figure is doing a lot of heavy lifting without much support. Resistance training does acutely raise testosterone, but the magnitude and duration of that effect depend heavily on study design, population, training volume, and how you measure the hormone.

A frequently cited study by Kraemer and Ratamess (2005, Sports Medicine) confirmed that resistance exercise produces acute testosterone elevations, but these spikes are transient, often returning to baseline within 30 to 60 minutes post-exercise. Long-term resting testosterone increases from training are real but modest. A meta-analysis by Riachy et al. (2020, World Journal of Men's Health) found that chronic exercise increases testosterone, but effect sizes varied widely, and sedentary, obese men saw the largest gains, not already-active individuals. A 40% sustained increase over four weeks is not a figure that appears consistently in peer-reviewed literature. It may reflect an acute spike in a specific population under specific conditions, extrapolated way beyond what the data actually shows.

What did they get wrong (or right)?

She got the general direction right. Resistance training does raise testosterone, and sedentary people who start lifting will likely see measurable hormonal changes. That part is solid.

Where she goes wrong is the precision of that "40%" claim. Numbers like that circulate in fitness content without clear sourcing, and presenting a likely best-case acute spike as a general outcome over four weeks is misleading. Viewers watching this might expect dramatic hormonal shifts from a month of gym work, which sets up unrealistic expectations.

The symptom framing is also sloppy. Low libido, fatigue, and body composition changes are associated with clinically low testosterone, but they're also symptoms of poor sleep, depression, thyroid dysfunction, and a dozen other conditions. Casually linking "someone still sleeping" to low testosterone is the kind of oversimplification that sends people down the wrong diagnostic path.

• Right: resistance training raises testosterone
• Right: low T affects libido, energy, and body composition
• Wrong: the 40% figure lacks consistent peer-reviewed support
• Wrong: symptom attribution is far too broad

What should you actually know?

If you genuinely have symptoms of low testosterone, the only way to know is a blood test. Symptoms overlap with too many other conditions to self-diagnose from a TikTok checklist.

Exercise is a legitimate, evidence-based tool for supporting healthy testosterone levels, especially if you're sedentary, carry excess body fat, or sleep poorly. But it is not a replacement for clinical evaluation if your levels are genuinely low. Clinically defined hypogonadism, typically a total testosterone below 300 ng/dL combined with symptoms, often requires more than a gym membership to address effectively.

Other lifestyle factors with solid research behind them include improving sleep quality (Leproult and Van Cauter, 2011, JAMA, showed one week of sleep restriction dropped testosterone by 10 to 15%), reducing alcohol intake, managing body weight, and addressing chronic stress. These are the unglamorous answers that don't go viral, but they're what the data actually supports.

If you're concerned about your testosterone levels, start with a conversation with a clinician, not a supplement stack or a four-week program promising 40% gains.