Step Into Support for Endurance and Strength (SISTERS)

Inclusion Criteria: * Patients ≥18 years of age with a gynecologic cancer (ovarian, fallopian tube, primary peritoneal carcinoma, uterine, or cervical) who have completed cancer treatment ≥ 6 weeks prior. * Own a smartphone (Android or iOS). * Can read and provide informed consent in English. * Do not have cognitive, visual, or orthopedic impairments that preclude participation, as evaluated by the research staff or oncology provider. * Insufficiently active, as indicated by a score of \<14 on the Leisure Score Index of Godin Leisure-Time Exercise Questionnaire (LSI). * No future chemotherapy planned (except maintenance treatments; e.g. PARP inhibitors or endocrine therapy) Exclusion Criteria: * Patients already participating in a mobile health intervention. * Patients who do not own a smartphone or computer to transmit data from the wearable tracker. * Self-reported inability to walk 2 blocks (at any pace). * Patients who are unable to identify a social support partner (i.e. family member, friend, or partner) to participate in the study (if selected for the intervention arm). * The following special populations will be excluded from this research: * Adults unable to consent * Individuals who are not yet adults (infants, children, teenagers) * Pregnant women * Prisoners