I often tell patients that lifestyle isn’t just a backdrop to fertility — it is part of the biology we need to understand if we want conception to unfold smoothly. Physical activity is one of those powerful lifestyle factors: it affects metabolism, hormones, body composition, blood flow, and even psychological well-being. But when you look at the research, the story isn’t as simple as “more movement = better fertility.” Let’s dig into what the evidence actually shows and — importantly — how to apply it in real life when you’re trying to get pregnant.¹
A recent narrative review summarized by the fertility experts at FACTS found that most interventions involving increased physical activity were associated with improved fertility outcomes, especially in women with obesity or metabolic dysfunction. Overall, 15 of 16 studies included in that review reported a positive association between exercise and fertility metrics such as conception and pregnancy.¹
In women with obesity and infertility, one study reported a remarkable 50% pregnancy rate following a structured weight-loss and exercise program, while supervised aerobic activity was tied to more regular menstrual cycles and better glucose and insulin profiles.¹
When we look at the broader research landscape, a more nuanced picture emerges:
- Moderate activity — think brisk walking, cycling, swimming, dance classes — tends to support hormonal balance and ovulatory regularity.²
- Excessive, very high-intensity training, especially when paired with inadequate nutrition, can suppress reproductive hormones and ovulation, a condition we recognize clinically as functional hypothalamic amenorrhea.³
- Large reviews have found mixed results overall, with no consistent association between moderate or vigorous activity and spontaneous fertility in all populations.⁴
This is where I often pause with patients and say something that sounds simple but carries substantial biological truth: fertility thrives in balance, not extremes.
Here’s how I translate this science into practical guidance in the exam room:
1. Prioritize moderate, enjoyable activity.
Aim for routines you can sustain — walking, hiking, yoga, Pilates, light strength training — that support cardiovascular health without chronically elevating stress hormones.
2. If you’re training intensely, pay close attention to your cycle.
Missed periods, shorter luteal phases, or irregular ovulation can be early signs that energy expenditure exceeds energy intake.
3. Fuel your body as intentionally as you move it.
This recommendation is often forgotten: exercise without adequate nutrition can quietly undermine fertility rather than support it. The reproductive system is exquisitely sensitive to energy availability, and even subtle deficits can signal the brain to “down-regulate” ovulation.
4. Context matters.
Women with obesity and metabolic dysfunction frequently see meaningful improvements in ovulation and insulin sensitivity when exercise is combined with dietary and lifestyle changes — and that can translate into higher pregnancy rates.¹
Although the FACTS review focused on women, fertility is always a team effort. Research in men suggests that moderate physical activity is associated with improved semen quality, likely through reductions in oxidative stress and better hormone regulation.⁵
At the same time, prolonged high-intensity endurance training, heat exposure, and chronic physical stress may negatively affect sperm production — another reminder that balance, not excess, tends to support reproductive health in both partners.
Exercise shouldn’t be oversimplified as “always good” or “always risky.” As with many aspects of reproductive medicine, the impact depends on intensity, duration, energy balance, and individual physiology.
For most people trying to conceive, the evidence points toward a few guiding principles:
- Moderate, consistent movement supports a fertile internal environment
- Extreme training without sufficient fueling can disrupt hormones and cycles
- Individuals with metabolic challenges often see the greatest fertility gains when exercise is part of a structured, sustainable lifestyle plan
What I love about this research is that it pushes us away from one-size-fits-all advice and toward something far more powerful: personalized fertility care grounded in physiology, not trends. Movement can absolutely be part of fertility medicine — but only when it’s paired with nourishment, recovery, and respect for the body’s deeper biological rhythms.
- FACTS About Fertility. “The Impact of Exercise on Fertility: A Review of the Evidence.” Accessed January 2026. https://www.factsaboutfertility.org/the-impact-of-exercise-on-fertility-a-review-of-the-evidence/.
- Ferrara, Lucia, et al. “Physical Activity and Female Fertility: A Narrative Review.” International Journal of Environmental Research and Public Health 20, no. 14 (2023): 6374. https://pmc.ncbi.nlm.nih.gov/articles/PMC10310950/.
- Gordon, Catherine M., et al. “Functional Hypothalamic Amenorrhea: An Endocrine Society Clinical Practice Guideline.” Journal of Clinical Endocrinology & Metabolism 102, no. 5 (2017): 1413–1439. https://doi.org/10.1210/jc.2017-00131.
- Wise, Lauren A., et al. “Physical Activity and Fecundability in a North American Preconception Cohort Study.” Fertility and Sterility 112, no. 4 (2019): 789–797. https://pmc.ncbi.nlm.nih.gov/articles/PMC7614776/.
- Gaskins, Audrey J., and Jorge E. Chavarro. “Physical Activity and Reproductive Health.” Clinical Journal of Sport Medicine 29, no. 1 (2019): 2–8. https://www.mdpi.com/2077-0383/14/10/3442.
Dr Marina OBGYN