FILE - In this Aug. 13, 2014 file photo, workers sit at desks at a call center in the northern border city of Tijuana, Mexico. If you spend all day sitting, then you might want to schedule some time for a brisk walk - just make sure you can spare at least an hour. Scientists analyzing data from more than 1 million people found that it takes about 60 to 75 minutes of “moderate intensity” exercise to undo the damage of sitting for at least eight hours a day. Not exercising and sitting all day is as dangerous as being obese or smoking, they found. (AP Photo/Alex Cossio, File)
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