For their study, the researchers took 261 healthy men aged from 25 to 40 who previously performed some exercise. The first group performed moderate exercises (walking or jogging on a treadmill for 25-30 minutes per day, 3-4 times a week) over 24 weeks. The scientists compared this group to two other groups that were exercised more intensively, and to one that didn’t perform any physical activity.
The findings of the research show that all men who exercised had improved sperm but those who were in a group with moderate exercises, showed the best results. Their volume of sperm rose by 8.3% compared to men who didn’t exercise.
More information about the research is here.