Born with Couch Potato Genes?

An anonymous reader writes "Science Daily is reporting on an experiment that suggests that an individual's activity level shows a genetic basis. From the article: 'Research conducted by scientists at the Oregon National Primate Research Center at Oregon Health & Science University reveals that a person's level of activity is likely an intrinsic property of that individual. [...] Overall, these findings suggest that it is likely to take a significant conscious effort to change one's level of physical activity and override one's intrinsic inclination to be active or inactive. To state it more plainly, if you're a couch potato, suddenly becoming active may be harder than you think,'"