If you spend most of your days sitting at school, work, at computer or stretched out on couch at home, you may be taking up to two years off your life. It is common knowledge that sedentary lifestyle increases risk of heart disease, type 2 diabetes, cancer and obesity, and can result in premature death. Many people think they can compensate for sitting around by walking, playing sports or going to gym. Unfortunately, this might not be so. new study just published in journal 'Annals of Internal Medicine' suggests effect on our longevity from sitting for long periods of time cannot be reversed through exercise. Even 60 minutes of daily exercise may not be enough. study is from Dr David Alter and his colleagues at Toronto University. Dr Alter and his team analysed 47 studies that tracked different groups of people, who kept notes on how long they sat down each day and how much they exercised. They found that most sedentary groups had 24% increased chance of dying during course of study than least sedentary ones. This remained case even though those who sat lot also did 60 minutes of daily exercise. Dr Alter writes: "Reducing your sit-down time by 2-3 hours each day by standing up at your desk, taking frequent breaks to stretch and walk, or watching TV…on your feet may be better than expensive, crowded, smelly gym and be just what doctor ordered."