We placed the trial in outpatient psychiatric rehabilitation programs, settings that provide potentially unrealized opportunities to deliver lifestyle interventions. These programs serve large numbers of persons with serious mental illness and offer vocational and skills training, case management, and other services. Programs typically have commercial kitchens and communal space that can be used for multiple functions, including group exercise. Program enrollees often attend these programs multiple times each week, which facilitates the delivery of lifestyle interventions that involve frequent contact.