Short bursts of exercise such as jogging up a flight of stairs every day could be the secret to boosting heart health. Less than five minutes of moderate to vigorous intensity physical activity significantly improved cardiorespiratory fitness in otherwise sedentary or physically inactive adults. Researchers evaluated 11 clinical trials from Australia , Canada, China and the UK said so-called “exercise snacks” could counter the damaging effects of prolonged sitting. Author Dr Hugo Olmedillas, of