Physical activity is widely recognised as beneficial for metabolic, cardiovascular, and psychological health. Its relationship with female fertility is, however, more complex and highly dependent on dose, energy availability, and individual physiological context.
In reproductive medicine, exercise is best understood not as a binary factor (good or bad), but as part of an overall energy and endocrine balance that influences hypothalamic-pituitary-ovarian (HPO) function. For women attempting conception, whether naturally or through assisted reproductive technologies, the relevant clinical question is how different levels and types of physical activity are associated with reproductive outcomes. This review summarises the current evidence with appropriate caution regarding causality.
Quick answer: For most women trying to conceive, moderate physical activity of around 150 to 300 minutes a week supports fertility and is considered safe. Reproductive function is more sensitive to energy balance than to exercise itself, so problems mainly arise when heavy training combines with low energy availability, which can disrupt ovulation and menstrual cycles.
Lifestyle matters for fertility. A BMC Public Health study found that women with 4–5 healthy habits had a 59% lower risk of infertility.
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takes 3 minutes to completeEvidence grading used in this review:
Reproductive function is sensitive to energy availability. When energy expenditure is high relative to intake, hypothalamic signalling may be altered, leading to reduced GnRH pulsatility and downstream suppression of LH and FSH secretion. This can result in menstrual irregularities, luteal phase dysfunction, or functional hypothalamic amenorrhoea (FHA), particularly in women with low body fat or high training loads.
Evidence grade: A. This relationship is strongly supported by studies in athletes and women with FHA, including endocrine and clinical outcome data.
In women with polycystic ovary syndrome (PCOS), exercise is associated with improved insulin sensitivity and reduced hyperinsulinaemia. These changes may contribute to improved ovulatory function in some women.
Evidence grade: A. Supported by randomised controlled trials and systematic reviews. Exercise is recommended as part of first-line lifestyle management in international PCOS guidelines.
Exercise can influence cortisol levels acutely, but the relationship between exercise-induced stress and fertility outcomes in humans remains inconsistent. Any potential reproductive effect appears more strongly related to overall physiological stress and energy balance than to exercise intensity alone.
Evidence grade: C.
Moderate physical activity is generally associated with neutral or slightly improved fecundability in prospective cohort studies. Examples include brisk walking, recreational cycling, and moderate aerobic exercise. However, effect sizes are modest and confounded by body composition, diet, and socioeconomic factors.
This content is for educational purposes only. It has been reviewed for scientific accuracy, but it does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding medical questions or fertility treatment decisions.
Reviewed for scientific accuracy by: Dr. Mona Bungum
Last reviewed: August 2026
Lifestyle matters for fertility. A BMC Public Health study found that women with 4–5 healthy habits had a 59% lower risk of infertility.
Fill out the questionnaire, and get a personalised, holistic and evidence-based programme tailored to you.
takes 3 minutes to completeEvidence grade: B.
Associations between vigorous exercise and reduced fecundability are inconsistent. Some studies report longer time-to-pregnancy in women with high training volumes, particularly in endurance sports, while others show no association. Where associations are observed, they are most evident in women with low BMI or low energy availability.
Evidence grade: B to C.
A sedentary lifestyle is associated with poorer metabolic health and increased risk of ovulatory dysfunction. However, effects are largely mediated through BMI and insulin resistance rather than inactivity itself.
Evidence grade: B.
Moderate physical activity during fertility treatment does not appear to negatively influence ovarian response, implantation, or pregnancy outcomes in available observational studies. Some studies suggest potential benefits for psychological wellbeing and treatment adherence.
Evidence grade: B.
Clinical recommendations often advise avoiding high-impact or vigorous exercise during ovarian stimulation and the peri-implantation period. This is primarily based on physiological considerations, such as ovarian enlargement and torsion risk, rather than robust outcome data. Evidence for harm is limited and not consistent across studies.
Evidence grade: C.
Low energy availability, whether due to high exercise load, restrictive eating, or both, is associated with suppression of reproductive hormone signalling and menstrual disturbances. This is well described in athletes and women with FHA.
Evidence grade: A.
In women with overweight or obesity, exercise is associated with improved metabolic parameters and may improve ovulatory function, particularly when combined with modest weight loss. The strongest evidence is in women with PCOS.
Evidence grade: A.
Moderate aerobic activity is consistently associated with neutral or beneficial reproductive outcomes in observational studies.
Evidence grade: B.
Resistance training improves insulin sensitivity and body composition. Direct fertility-specific data are limited, but the metabolic improvements are considered potentially beneficial.
Evidence grade: B.
High-volume endurance training may be associated with menstrual disturbances in susceptible individuals, particularly in the context of low energy availability. However, the effects are not universal.
Evidence grade: B to C.
Physical activity is associated with reduced stress, anxiety, and depressive symptoms in many populations. Since psychological stress may influence reproductive function via neuroendocrine pathways, this may represent an indirect mechanism. However, causality between exercise-mediated stress reduction and improved fertility outcomes remains unproven.
Evidence grade: B.
Evidence grade: A.
Current evidence is limited by:
Key unanswered questions include:
Yes, but the effect depends on dose and context. Moderate activity is generally neutral or beneficial for fertility, while very high training loads combined with low energy availability can suppress ovulation and disrupt the menstrual cycle. Reproductive function responds more to overall energy balance than to exercise alone.
There is no single threshold that applies to every woman. Around 150 to 300 minutes of moderate activity a week is consistent with general health guidance. Risk rises mainly when high-intensity or high-volume training is paired with inadequate energy intake or a low BMI.
It can in susceptible women. When energy expenditure consistently exceeds intake, hypothalamic signalling can be altered, reducing the hormones that drive ovulation. This may cause irregular cycles or functional hypothalamic amenorrhoea, most often in women with low body fat or very high training loads.
Moderate activity does not appear to harm ovarian response, implantation, or pregnancy outcomes in available studies, and may support psychological wellbeing. High-impact or vigorous exercise is often avoided as a precaution during ovarian stimulation because of ovarian enlargement and torsion risk, though evidence of harm is limited.
For most women, a combination of moderate aerobic activity and resistance training is reasonable. Resistance training and aerobic exercise both improve insulin sensitivity and body composition, which is particularly relevant for women with PCOS.
The evidence is strong here. In women with PCOS, exercise improves insulin sensitivity and may restore ovulatory function, especially when combined with modest weight loss, which is why it is recommended as first-line lifestyle management in international guidelines.
In many cases, yes. When reduced training and adequate energy intake restore energy balance, hormonal signalling and regular ovulation often return over the following months, although individual recovery varies.
This is an open research question. While some approaches adjust activity to each phase of the cycle, there is not yet robust evidence that timing exercise to specific cycle phases changes fertility outcomes.
The relationship between exercise and female fertility is best described as dose-dependent and context-specific rather than linear. Moderate physical activity is generally associated with neutral or potentially beneficial reproductive outcomes, particularly in women with metabolic dysfunction, while high training loads may be associated with menstrual and ovulatory disturbances in the presence of low energy availability.
Overall, reproductive function appears more sensitive to energy balance than to exercise alone. The clinically relevant interpretation is that exercise should be maintained in most women trying to conceive, while avoiding chronic energy deficit and excessive training loads in susceptible individuals.
Evidence grading used in this review:
