Strength Training and Women's Hormones: What Changes When You Lift Weights?

Does weightlifting change female hormones? Yes, but not as much as your Instagram feed claims.

A challenging resistance workout can temporarily change hormones involved in stress, energy use and recovery. Over time, strength training for women can also improve insulin sensitivity, preserve muscle, strengthen bones and help counter some of the body-composition changes that occur during perimenopause and menopause.

But estrogen, progesterone, testosterone and cortisol don't simply go "up" or "down" because you started lifting weights. The relationship between exercise and female hormones is much more nuanced and depends on factors including age, menstrual status, nutrition, recovery, training intensity and stage of life.

There's another complication: women have historically been underrepresented in sports and exercise research. Although that's improving, a 2025 review found that female participants still represented less than half of participants in recent sports and exercise medicine research, and relatively few studies adequately considered menstrual status.

So, what is there to know about weightlifting, women’s hormones and menopause?

How Does Strength Training Affect Female Hormones?

Resistance exercise creates a temporary physiological stress. Your body responds by activating systems that help provide energy and adapt to the demands of exercise.

After a challenging strength-training workout, hormones and signaling pathways involved in metabolism and recovery can temporarily change.

These responses may include:

• Cortisol, which helps mobilize energy during exercise

• Growth hormone, which can rise after certain types of resistance exercise

• Muscle repair and adaptation: changes in the metabolic signals

• Improved insulin sensitivity with regular exercise

Women also produce testosterone, although circulating levels are substantially lower than in men. Exercise can influence the hormonal environment, but short-term hormone fluctuations after a workout shouldn't be confused with permanent changes in a woman's hormone levels.

More importantly, the benefits of resistance training don't depend on producing a huge post-workout hormone surge. Your muscles adapt primarily because they have been challenged and then given adequate nutrition and recovery to rebuild.

Strength Training, Estrogen and Progesterone

Does strength training increase estrogen?

Not necessarily – and increasing estrogen isn't the primary reason women benefit from lifting weights.

Estrogen and progesterone fluctuate naturally throughout the menstrual cycle and change significantly during perimenopause and menopause. These hormones can influence tissues involved in exercise, including muscle and bone.

Estrogen is particularly important for bone health and skeletal muscle, which is one reason resistance training becomes increasingly valuable as women approach menopause and estrogen levels begin to decline.

Strength training doesn't replace estrogen. Instead, it provides an independent stimulus that helps maintain muscle strength, lean mass and bone health.

Should You Change Strength Training During Your Menstrual Cycle?

The idea of cycle syncing workouts has become extremely popular.

You may have heard that women should lift heavy during one phase of the menstrual cycle and dramatically reduce exercise during another.

The evidence is not that simple.

A systematic umbrella review of menstrual cycle phase and resistance exercise showed highly inconsistent findings and the authors concluded that there is no consistent evidence to change resistance-training programs according to menstrual cycle phase.

That doesn't mean your cycle can't affect how you feel.

Some women notice changes in energy, sleep, motivation, cramps or perceived exertion at different points in their cycle. Others notice very little difference.

Rather than expecting each woman to be on a 28-day cycle, you can do the much easier thing and track your energy, performance and recovery for several months.

If you always seem to perform better on some days than others, by all means use that knowledge. However, if you aren’t noticing any patterns, there’s not really any reason to organize your whole workout schedule around your period.

Strength Training and Cortisol in Women

Does weightlifting increase cortisol?

For now, sure, and that's not necessarily a bad thing.

Cortisol is often called the "stress hormone," but cortisol has normal and necessary functions. During exercise, it helps make energy available to meet increased physical demands.

However, a short term spike in cortisol levels while you're doing difficult exercise is considered a normal physiological reaction.

The more serious issue isn’t the short-term spike in cortisol that results from a single bout of exercise. Instead, trouble arises if training stress consistently outstrips your capacity to bounce back, especially in conjunction with insufficient food, low levels of quality sleep or considerable mental strain.

Signs that your exercise and recovery may be out of balance can include:

• Persistent fatigue

• Declining performance

• Difficulty recovering between workouts

• Sleep disturbances

• Recurrent injuries

• Mood changes

• Menstrual irregularities

If these occur, simply adding more exercise isn't necessarily the answer.

Adequate food, protein, carbohydrates, rest and recovery are part of an effective strength-training program too.

B vitamins contribute to normal energy metabolism. For women looking for nutritional support as part of an active lifestyle, Village Green carries B-Complex 50.

Low Energy Availability and Female Hormones

One issue active women should know about is low energy availability.

Low energy availability describes a state in which there is not enough energy left over from exercise to fuel all of the physiological processes necessary for health.

This can happen intentionally through restrictive dieting, but it can also happen accidentally when training volume increases without a corresponding increase in food intake.

Prolonged low energy availability can affect reproductive function, bone health, metabolism, recovery and athletic performance. It is an important component of Relative Energy Deficiency in Sport (RED-S).

This implies that menstrual changes in highly active women should not necessarily be attributed to a normal side effect of rigorous exercise.

If your periods become irregular or stop after increasing your training, talk with a healthcare professional.

Does Strength Training Increase Testosterone in Women?

Testosterone is also made by women, and is involved in many physiological processes.

One of the most common myths about women and weightlifting is that lifting heavy weights will dramatically increase testosterone and make women excessively muscular.

This is not how the female hormonal response to resistance exercise works.

Resistance exercise can cause short-term changes in hormones, but women don’t develop testosterone levels in the male range just by lifting weights.

Building substantial muscle also takes time, adequate nutrition and progressive training.

For most women, strength training is much more likely to result in increased strength, improved function and preservation of lean muscle than the sudden "bulking up" many beginners fear.

Strength Training During Perimenopause

I want to mention perimenopause and strength training in particular.

During perimenopause, estrogen and progesterone fluctuate and eventually decline. At the same time, age-related changes can make preserving muscle and bone increasingly important.

Women may also experience:

• Changes in body composition

• Reduced muscle mass or strength

• Changes in sleep

• Hot flashes and night sweats

• Changes in energy and recovery

• Increased risk of bone loss over time

Resistance training won't stop menopause or "balance" every hormone, but it can directly address several health changes that become more important during this stage of life.

This means that strength training is one of the best lifestyle moves during perimenopause for keeping up physical function as women get older.

Strength Training After Menopause: Muscle and Bone Benefits

The case for strength training after menopause is particularly strong when it comes to maintaining muscle and bone.

In 2025, a systematic review and meta-analysis of 17 randomized controlled trials encompassing 690 postmenopausal women discovered that resistance training has a significant positive impact on bone mineral density at the lumbar spine, femoral neck and total hip.

Resistance training can also assist women in maintaining their strength and physical function in later life.

This is important because this period of transition coincides with the typical age-related decline in muscle mass and bone density. Preserving strength is not only about looks; it can help to maintain our mobility, independence, and health over the long term.

High-intensity resistance and impact training has also been investigated in menopausal women as a means to combat age-related bone loss and functional impairment.

The appropriate exercise intensity depends on the individual, particularly for women with osteoporosis, injuries or other medical conditions. If you're new to resistance training or have low bone density, getting professional guidance is worthwhile.

Women's Exercise Research Is Improving – But Gaps Remain

A second reason that women’s exercise guidance is sometimes confusing is that studies on female athletes have not always caught up with women’s involvement in sports and exercise.

One 2025 review that looked at over 1,400 studies in the sports and exercise medicine field, published between 2021 and 2023, found that while 44 percent of study participants were women, which is better than previous findings, women were still underrepresented.

Even more striking, only 5.6% of studies involving women incorporated menstrual-status considerations into their study design.

So while we know considerably more about female exercise physiology than we once did, there are still important research gaps.

This is another reason to be skeptical of rigid social-media rules telling every woman exactly how she should exercise during each week of her cycle.

Hormones, Exercise and Individualized Care

Changes in energy, exercise tolerance, menstrual cycles, sleep and body composition can have many causes.

Sometimes training or nutrition is part of the picture. Other times, symptoms may be related to perimenopause, menopause, thyroid function, iron status, medications or another health issue.

Menopausal hormone therapy and hormonal contraception do not work in the same way, nor should they be considered interchangeable.

Laboratory testing and a medical evaluation may be helpful in putting these situations in perspective when there is reason to believe that circumstances other than the training program may be contributing.

A Village Green Apothecary lab review consultation can help you better understand your results and questions to discuss with your healthcare provider.

When customized hormone therapy is medically appropriate, Village Green Apothecary's compounding pharmacists can also work with your prescriber to prepare an individualized prescribed formulation.

How to Support Hormones While Strength Training

You don't need an elaborate "hormone balancing" workout plan to benefit from resistance exercise.

Focus first on the fundamentals:

• Strength train consistently and progressively.

• Eat enough to support your activity level.

• Include adequate protein throughout the day.

• Don't chronically eliminate carbohydrates if you're training hard.

• Prioritize sleep and recovery.

• Track menstrual changes, energy and performance if doing so is useful to you.

• Allow easier training days when your body needs them.

• Don’t assume that if you’re tired, it means you have to work out more.

Most importantly, your training program should be sustainable.

No matter what you’ve read, there’s no perfect strength-training program that lines up with a theoretical hormone chart. The best program is one that works your muscles hard enough, lets them recover well, and that you can follow long-term.

Key Takeaways: Strength Training and Women's Hormones

• While strength training does affect female hormones, many of these hormonal changes caused by exercise are short-lived, as they are a normal physiological response to physical exertion.

• During resistance training, cortisol levels can be elevated, but an acute elevation in cortisol is not equivalent to high cortisol levels over time.

• Women won’t necessarily bulk up with strength training and it doesn’t cause a huge increase in testosterone.

• Currently, there is no strong evidence to suggest that resistance training should be strictly modified by menstrual cycle phase in all females.

• Keep in mind that your energy, symptoms and recovery can still vary throughout your cycle. Therefore, tracking your individual patterns can be helpful.

• Low energy availability may negatively impact reproductive hormones, menstruation, bone density and recovery.

• It’s even more critical at this point (perimenopause and after menopause) because resistance training can help retain muscle, strength and bone.

• A 2025 meta-analysis found significant improvements in bone mineral density with resistance training in postmenopausal women.

• However, women continue to be underrepresented in certain areas of exercise research, and menstrual status continues to not be considered appropriately in many research studies.

Frequently Asked Questions About Strength Training and Female Hormones

Can strength training affect women's hormones?

The answer is yes. Resistance exercise causes acute changes to hormones that mediate stress, metabolism, and recovery responses, such as cortisol and growth hormone. Strength training also induces long-term metabolic and musculoskeletal adaptations, including improved insulin sensitivity, increased strength, improved muscle function, and bone health. It doesn't necessarily increase or decrease "all female hormones."

Does weightlifting increase testosterone in women?

Even though resistance exercise can produce temporary fluctuations in hormones, it will not result in women having the high levels of testosterone found in men. Women can build muscle and strength without dramatic, or permanent increases in testosterone.

Does strength training increase estrogen?

Strength training isn't a treatment for low estrogen and shouldn't be expected to substantially increase estrogen levels. However, resistance training can help support muscle and bone health as estrogen declines during perimenopause and menopause.

Should women exercise differently during their menstrual cycle?

There’s no evidence to suggest that there is a one-size-fits-all cycle-based strength-training program for all women. Some women report feeling different levels of energy, experience different symptoms or have different recovery rates at different times of the month, while other women report none of these things. Rather than relying on a calendar, it’s more beneficial to tailor training to your own symptoms and performance.

Is strength training good during perimenopause?

Strength training can help protect against some of the negative effects that can happen in perimenopause, such as loss of muscle mass and strength, as well as decreases in bone density and physical function that occur during times of hormone change and aging.

Is weightlifting good after menopause?

Resistance training is an important form of exercise after menopause. Research shows that it can improve strength and help maintain or improve bone mineral density. The appropriate intensity and exercises depend on fitness level, bone health, injuries and other medical considerations.

Can too much exercise affect women's hormones?

Yes. The high training demands coupled with poor energy intake may contribute to low energy availability and RED-S, which may impact menstrual function, bone health, metabolism, recovery, and performance. For example, changes like skipped or irregular periods in an active woman should be appropriately evaluated.

Does strength training increase cortisol?

Short-term elevations in cortisol can occur with difficult workouts due to normal stress responses. This is not to be confused with chronically elevated cortisol levels. Stress responses are a combination of training load, nutrition, sleep, mental stress, and recovery.

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