Habitual physical activity decreases risk of multiple negative health outcomes, including breast cancer recurrence and mortality. It is also associated with better quality of life and reducing negative effects of cancer and cancer treatment. However, most breast cancer survivors do not engage in sufficient physical activity. Behavior change interventions produce short-term increases in activity but have difficulty motivating sustained active lifestyles over longer periods and are not equally effective in women of different races/ethnicities. The purpose of this study is to test a novel intervention that uses video games and storytelling to increase motivation. Video game mechanics increase enjoyment and feelings of autonomy (control), competence, and relatedness to others. All of these feelings are associated with motivation for activity and, in turn, sustained activity over time. Additionally, narrative storytelling is an effective method of persuading individuals to change their behavior. We propose that play of active video games that include compelling storylines will increase physical activity among a diverse sample of postmenopausal breast cancer survivors.