What does largely sedentary mean? So, for example, running a marathon doesn't take much training. It averages about an hour per day, according to this [1]. The

What does largely sedentary mean? So, for example, running a marathon doesn't take much training. It averages about an hour per day, according to this [1]. The runners seem to be living "largely sedentary" lives, playing video games, watching TV, sitting for work, etc. It sure seems like running has some positive effects [2]. Are you saying that Stephenson's approach of walking slow most of the day is pretty much the only way to unlock an extra year or five? My argument is, of course, argument via google. There's so much contradictory information and economic motive to, well, lie that it's hard for me to get a grip on what's actually sensible. Some regular exercise sounds like a good argument, and there's some evidence to back that up ([2] for example), but it sure has the feeling of folklore. [1] http://well.blogs.nytimes.com/2013/10/30/the-marathon-runner-as-couch-potato/?_r=0 http://well.blogs.nytimes.com/2013/10/30/the-marathon-runner... [2] http://www.hs.iastate.edu/news/2014/07/28/iowa-state-professor-finds-leisure-running-reduces-mortality-risk/ http://www.hs.iastate.edu/news/2014/07/28/iowa-state-profess...