Stand up to ageing: why sitting is the new smoking summarizes research showing that excessive sitting, or sedentary behavior, is linked to negative health outcomes like diabetes, cardiovascular disease, obesity, and premature death. The document discusses how people, especially older adults, spend large portions of their day sitting and provides tips for breaking up prolonged sitting periods by planning activity breaks when watching TV, using the computer, or making phone calls. It encourages standing up at least every 30 minutes based on new Australian physical activity guidelines.