Background
Half of all U.S. adults do not participate in regular physical activity and women consistently report less activity than men [Evidence suggests that characteristics of the environments in which people live can facilitate or inhibit physical activity [On the other end of the spectrum, individual level interventions delivered one-on-one can also be efficacious in changing physical activity behaviors [A limitation of past research is the under-recognition that individual-level programs may be most effective when delivered in environments that support and maintain the promoted physical activity changes, thus prompting calls for intervention programs that combine individual- and environmental-level changes [We propose to evaluate the effects of a multilevel community-based intervention package to increase moderate intensity physical activity using a cluster randomized design, using public housing developments as the unit of randomization. We expect that delivery of an intervention package targeted to the environmental and individual levels will improve overall physical activity levels to recommended guidelines at the housing development level [