How Exercise Supports Fertility
Regular moderate exercise improves fertility in several ways: better insulin sensitivity (especially helpful in PCOS), healthier weight, improved blood flow to reproductive organs, lower stress hormones, better sleep and improved overall metabolic health. Studies link 30-60 minutes of moderate activity most days with shorter time to conception and improved IVF outcomes. For overweight women in particular, regular exercise often restores ovulation. Exercise also benefits male fertility by supporting healthy testosterone levels and improving sperm parameters in many studies.
When Exercise Becomes a Problem
Excessive endurance training: Marathon-level training can suppress ovulation, especially in women with low body fat
Very high training volume in lean women: Can cause hypothalamic amenorrhoea — periods stop entirely
Hot yoga, saunas and very hot baths for men: Can temporarily reduce sperm count and motility
Cycling more than 5 hours per week: Some evidence of reduced sperm count due to heat and pressure
Anabolic steroid use: Severely suppresses sperm production, sometimes permanently
Exercise paired with restrictive eating: Combination is particularly damaging to ovulation
Finding the Right Balance
For women with normal weight and regular periods: Continue or start moderate exercise (150 minutes per week of mixed cardio and strength)
For overweight women or PCOS: Even modest weight loss (5-10%) often restores ovulation. Combine cardio with strength training
For lean or underweight women with absent periods: Reduce training intensity and volume, increase calorie intake. Add rest days
For men: 30-60 minutes most days improves fertility. Avoid excessive heat to the testicles (long baths, laptop on lap)
During IVF stimulation: Avoid high-impact and high-intensity exercise after day 6 — risk of ovarian torsion. Walking, gentle yoga and swimming are safe
After embryo transfer: No need for bed rest. Resume normal moderate activity within 24-48 hours
Signs You May Need to Adjust
Periods have become irregular or stopped since increasing training
You have lost more than 5% of body weight unintentionally
You have low energy, mood changes or recurrent injuries
You are training more than 7 hours per week and having difficulty conceiving
You have been told you have hypothalamic amenorrhoea
You feel exercise has become compulsive or anxiety-driven