Individuals with serious mental illness have greater morbidity from physical illness and mortality than the general population, but tend not to initiate or sustain engagement in health promotion interventions. Although promising weight management and wellness interventions have been developed for this population, they are very intensive and tend to have low enrollment, high attrition, and low reach. This pilot study will investigate a novel low-demand intervention that may be initially more acceptable, the Get Moving and Get Well! (GMGW) program. The primary objectives of the proposed study are to investigate the effects of participation in the GMGW program on measures of behavioral activation, self-efficacy, physical activity, general physical and mental health, mood, participants' intent to engage in more intensive physical health interventions, and actual engagement in those programs. Results of this pilot study will inform a future full-scale study of GMGW.