Moreover, in a 10-year follow-up study of older women who participated in a 3-year clinical trial of walking, those who were randomized to the walking intervention were not only more active at the end of the study but also maintained higher physical activity levels compared with control women 10 years later (22). In summary, the DPP 150-min weekly physical activity goal was chosen because evidence supported its feasibility, effectiveness, and long-term maintenance.