The American Heart Association has designated a 1.06-mile loop in Des Moines’ downtown skywalk system as a Start! Walking Path to encourage downtown workers and residents to improve their heart health. The national initiative, which includes more than 200 designated walking paths nationwide, is sponsored by Subway Restaurants. According to the association, only 15 percent of American adults achieve the recommended levels of moderate aerobic exercise, 150 or more minutes per week. For more information, go to www.startwalkingnow.org.