Project Background: The relatively high rates of morbidity and mortality found among individuals with SMI have led to prioritization by Mental Health QUERI, and other groups, of prevention and health promotion in addition to improved coordination of physical health care for this population. Although promising health promotion interventions have been developed, they are intensive and none seem to successfully address the challenge of improving reach and enrollment while minimizing attrition. We propose to conduct a pilot evaluation of a novel low-demand intervention that may be an acceptable introduction to health promotion, the Get Moving and Get Well! (GMGW) program. Participants in the current version of GMGW have described benefits beyond those expected. We believe a 12-week GMGW program may be an effective and relatively low-demand intervention to promote self-efficacy and physical health in Veterans with SMI through increasing Veteran behavioral activation.