Extending the length of your daily walks can benefit your heart, new research suggests. In a study conducted among healthy adults, people who accumulated most of their daily steps in bouts of 15 minutes or longer had significantly lower risks of heart disease and death nearly a decade later than those who got in several shorter walks throughout the day. The study was published Monday in the Annals of Internal Medicine . What’s more, adults who had been less active in the past and went on longer