Can you be born a couch potato?

Can you be born a couch potato?: "The key to good health is to be physically active. The key to being active is… to be born that way? The well-documented importance of exercise in maintaining fitness has created the idea that individuals can manage their health by increasing their activity. But what if the inclination to engage in physical activity is itself significantly affected by factors that are predetermined? Two new studies suggest that the inclination to exercise may be strongly affected by genetics."