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As expected, the runners, training as they were for a marathon or half-marathon, reported spending considerable time sweating. On average, they exercised vigorously for nearly seven hours per week, “which far exceeds the standard exercise recommendation,” said Dr. Whitfield, who is now an Epidemiological Intelligence Service Officer at the Centers for Disease Control and Prevention in Atlanta.

But those hours of exercise do not seem to have reduced sedentary time. On an average workday, the runners reported sitting for more than 10 hours at the office and at home, easily topping the national average. (Almost all of the participants were employed; a few were students.) On non-workdays, the runners spent about eight hours inactive.

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– http://well.blogs.nytimes.com/2013/10/30/the-marathon-runner-as-couch-potato/?ref=todayspaper