Fitbit data spolights common periods of inactivity

By now, you no doubt received the memo: Sitting so much is killing you.Plenty of research on the topic exists. One such study released in March 2015 found that every hour of sedentary time per day, on average, is associated with a 14 percent rise in heart disease. Another study from earlier this year showed that extensive sitting time could be attributed to 3.8 percent of all deaths.After crunching its anonymous user data, Fitbit, which offers a new activity tracker called Alta th