Here's a new warning from health experts: Sitting is deadly. Scientists are increasingly warning that sitting for prolonged periods — even if you also exercise regularly — could be   1 for your health. And it doesn't matter where the sitting takes place — at the office, at school, in the car or before a computer or TV — just the overall number of hours it   2  .

Research is preliminary, but several studies   3 people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.