Armchair. Bus seat. Swivel chair. Barstool. Sofa. Most of us spend 50-70% of our time sitting down, even though we’re constantly being told that our comfy chairs are killing us softly. We’ve heard that long periods of sitting are associated with a 90% increase in the risk of death from heart problems and a 49% increase in the overall risk of dying. We’ve also heard that watching three hours of TV per day doubles your risk of mortality.