Do mass participation sporting events have a role in making populations more active?

Mass sporting events are becoming increasingly popular worldwide and may have health benefits as they foster low intensity participation in a non competitive, fun environment. We know little, however, about their long term effect, if any, on physical activity levels. This report describes the initial impact of three women only mass events in Ireland as well as the effectiveness of a series of initiatives designed to boost activity among the least active participants. It also presents key lessons and recommendations for all those charged with promoting physical activity in Ireland.