Partaking in a weekly park run or energetic Sunday cycle, while spending the rest of the time slumped at a desk may not seem a recipe for good health. But “ weekend warriors ” who shoehorn weekly exercise into one or two days, gain similar heart benefits as those who spread it out, a major study has shown. Compared with inactive people, those concentrating their activity showed similarly lower risks of heart attack, heart failure, abnormal heart rhythm, and stroke. Heart experts said people who