Disregarding the question of whether greater sperm motility is really desirable, a recent study at Yamaguchi University in Japan reveals that the most active sperm comes from moderately active people, OK, men. HealthDay reports that the researchers studied the sperm motility and exercise habits of 215 men, dividing the men into three groups: strenuous, moderate or light exercise. The researchers found that the moderate-exercise group had the highest average sperm motility and the fewest men with less than 40 percent sperm motility (14.3 percent), while 31 percent of those in the light-exercise group and 27 percent of those in the strenuous-exercise group had less than 40 percent sperm motility. Read more in HealthDay.