If we can help people do more physicalexercise - especially when they are at risk of illness or recovering from it - we can cut the number of deaths from conditions like heart disease and stroke.
The researchers say their findings are not conclusive but suggest that men who want to improve their fertility might want to look at increasing the amount of physicalexercise they do if they currently do little.
But according to the latest research, even when people do significant and regular exercise, they still increase their risks of serious illness from hours of physical inactivity.