Jordan SiemensGetty Images New research shows that if you have a physically demanding job but rarely exercise outside of those jobs, you may have a higher risk of a major adverse cardiovascular event (MACE), such as a heart attack or stroke. Physically demanding jobs don’t tend to improve cardiovascular fitness the way a brisk walk or moderately intense run can do. It’s important to find ways to fit in exercise—like going for a run during lunch, for instance—rather than assuming your work activity can make up for that kind of exercise. If you have a sedentary job, a breadth of research touts the benefits adding some exercise into your day. But what if your job has plenty of physical activity already? Does that make going for runs more optional?