Adding short bursts of exercise to your daily routine, such as cycling to the shops for 15 minutes or taking the stairs, lowers blood pressure, a study has found. Increasing exercise habits – in exchange, say, for watching a bit more TV or extending a snooze – is good for the heart, researchers said. However, they warned that people may need to do more than simple walking to really see changes. Published in the journal Circulation, the study emphasised that everyday activities which raise the heart rate, such as cycling, climbing stairs or short bursts of running, have the biggest benefits. Le…