This intervention, offered to participants after completing oncology rehabilitation, integrates known preferences and determinants of physical activity participation in women and breast cancers survivors including social support, professional guidance, self-efficacy, goal setting, self-regulation, and environmental awareness delivered through accessible technology. For the iteration phase, the investigators will conduct an initial, abbreviated intervention wave lasting 4 weeks; the investigators will then incorporate participant input and feedback on the specific components to refine the intervention prior to a pilot trial. Means of delivering the components include communication and support through tailored text messaging, health coaching phone calls, self-monitoring of physical activity through a wearable sensor, and environmental assessment of community physical activity options (e.g., parks, fitness centers, trails) based on global positioning system information.