Increasing and maintaining physical activity among female breast cancer (BC) survivors during treatment remains an unresolved problem in BC survivorship care. BC survivors, from diagnosis until the end of life, go through many transitions. One major transition is the significant decline of physical activity immediately after diagnosis. Despite the known benefits of physical activity—speeding recovery time and reduced cancer recurrence risk—less than 30% of survivors met physical activity recommendations. Physical activity interventions have shown effectiveness in helping BC survivors increase activity during treatment, but limited evidence-based activity interventions have been disseminated into the clinic and community. To address this limitation, we are partnering with the UTMB breast cancer support group to conduct a 12-week physical activity intervention, Pink Warrior, which will investigate the feasibility of implementing active video game-based physical activity intervention among BC survivors undergoing treatment within the support group setting. Participants (N = 60) will be randomized to participate in the support group using the active video game-based physical activity intervention or to participate in the existing UTMB breast cancer support group with pedometers. Our specific aims are: