Physical activity (PA) is an essential part of cancer survivors' treatment plan as it helps prevent recurrence and improves cardiovascular fitness and downstream cardiovascular risk, the cause for most deaths in cancer survivors. Additional benefits of increasing PA include improvements in body composition, physical function, psychological outcomes, and quality of life. However, most survivors are not sufficiently active and would benefit from an intervention to promote PA. Prior PA interventions for cancer survivors have had mixed success. A recent systematic review identified 14 RCTs testing exercise interventions among sedentary cancer survivors and concluded that there was insufficient evidence that existing interventions are successful in achieving recommended levels of PA. In particular, there has been a lack of attention to psychosocial aspects of changing behavior, and to strategies that promote independent exercise behavior that can be maintained over time. Thus, it is clear that novel approaches to PA interventions are needed.