Exercise and Male Fertility: What Helps Sperm Health
By Zsofia Jamieson and Marta Han, co-founders of The Fertility Class and certified Aviva Method instructors with 25 years of combined teaching experience. Last updated October 2026.
In short: Male factors contribute to about half of all infertility cases, and sperm health responds to lifestyle more than many men realize. Research links regular, moderate exercise with better sperm count, movement and shape, while long hours of sitting and very intense training are linked with poorer results. Because sperm take around three months to develop, changes made now show up in a semen analysis a season later.
Fertility conversations tend to center on women, yet a male factor is the sole cause in around one in five cases and a contributing cause in many more. The encouraging part is that sperm are renewed continuously. What a man does over the next few months shapes the sperm he produces after that.
Movement is one of the clearest levers, with an important qualification: the type and amount matter a great deal.
What the research shows
Sitting less matters
A Harvard study of 189 young men, published in the British Journal of Sports Medicine, found that the most active men had 73% higher sperm concentrations than the least active. Men who watched more than 20 hours of television a week had 44% lower concentrations than men who watched none.
Moderate beats intense
In a randomized trial published in Reproduction in 2017, 261 previously inactive men were assigned to moderate continuous running, high-intensity continuous running, high-intensity interval training or no exercise for 24 weeks. All three exercise groups improved, but the moderate group improved most, with semen volume up 8.3%, motility up 12.4% and sperm shape up 17.1%. It was also the only group to keep some of its gains 30 days after training stopped.
The benefits extend to men with infertility
A second trial by the same team followed 419 sedentary men who had been trying to conceive for more than a year. Twenty-four weeks of moderate aerobic exercise reduced inflammation and oxidative stress in semen and improved semen quality, sperm DNA integrity and pregnancy rates compared with no exercise.
Why intensity matters
Moderate exercise improves circulation, lowers inflammation and supports healthy hormone levels. Very intense or prolonged training can push in the other direction, raising oxidative stress and stress hormones that may harm developing sperm. Long hours on a bike saddle can add heat and pressure, both of which sperm are sensitive to.
What helps
- Move most days, at a moderate pace. Brisk walking, easy running or cycling, and mobility work.
- Break up long periods of sitting. Stand and move at least once an hour.
- Bring circulation to the pelvis. Hip and pelvic mobility work supports blood flow to the reproductive organs.
- Avoid overtraining. If you train hard, build in recovery, and reconsider very long endurance sessions while trying to conceive.
- Give it time. Because of the roughly three-month sperm cycle, changes take a few months to appear in a semen analysis.
How The Fertility Class approaches male fertility
Our men’s program applies the same principles as our women’s classes: short, targeted sequences that support circulation and pelvic function, paired with breath work and practical nutrition guidance. It suits any fitness background and is designed to be practiced on a steady weekly rhythm from home.
Many couples follow the men’s and women’s programs side by side, which makes consistency easier for both. Learn more about the men’s program.
Common questions
Does exercise improve sperm count?
Research links regular moderate exercise with better sperm concentration, motility and shape. In one randomized trial, moderate exercise improved semen quality more than high-intensity training did.
What exercise is bad for sperm?
Very intense or prolonged endurance training, and long hours of cycling, may reduce sperm quality. Long periods of sitting are also linked with lower sperm counts.
How long does it take for exercise to improve sperm?
Sperm take about three months to develop, so most studies measure changes after three to six months of regular exercise.
Should both partners exercise when trying to conceive?
Yes. Moderate movement supports fertility in both men and women, and practicing together makes it easier to stay consistent.
Sources
- Leslie SW, et al. Male Infertility, StatPearls
- Gaskins AJ, et al. Physical activity and television watching in relation to semen quality in young men, British Journal of Sports Medicine, 2015
- Hajizadeh Maleki B, et al. Comparison of three exercise modalities on male reproductive function, Reproduction, 2017 (summary)
- Hajizadeh Maleki B, Tartibian B. Moderate aerobic exercise training for improving reproductive function in infertile patients, Cytokine, 2017 (abstract)
More research on the movement behind our program is collected on our Studies page.
