A new Harvard study of 746 young sperm donors reports that men that exercise more have better sperm quality. The men, with an average age of 26, at least a high school education and no radiation exposure or sexually transmitted diseases, were qualified to donate to a sperm bank in their area. Compared to men that seldom exercised, those that reported the most total exercise and logged the most time doing intense workouts had better sperm motility, which increases the chances for sperm to move through the female reproductive tract to reach an egg.