Men, here’s another reason to work up a sweat: It boosts your sperm count.
Couch potatoes who watch lots of TV have fewer sperm than men who exercise moderately or vigorously each week.
Men who reported exercising more than 15 hours a week had 73 percent higher sperm counts than men who exercised fewer than 5 hours a week. And men who watched more than 20 hours of TV had 44 percent lower sperm counts than men who watched little to no TV.
It is possible that exercise produces more antioxidant enzymes that can prevent a natural process called oxidative stress from damaging cell membranes in the body. This damage can disrupt the creation of new sperm cells. Another possibility is that when men watch TV, their scrotums get squished against their bodies, making that region hotter and possibly preventing new sperm from being made.
Research has shown that sperm production slows if the scrotum temperature rises 1.8 to 3.6ºF (1 to 2ºC) above normal body temperature.
Bottom Line: If you want to improve your sperm count, you should get active and get off of the couch.