Breast Cancer, Reasoning, and Activity Intervention

Inclusion Criteria * PRE-REGISTRATION: Age ≥50 years at time of pre-registration visit according to participant report and/or clinical determination * PRE-REGISTRATION: First, primary diagnosis of stage I-IIIa breast cancer according to participant report and/or clinical determination * PRE-REGISTRATION: Post-surgery and completed primary treatment (i.e., surgery, chemotherapy, and/or radiation therapy) 3-36 months prior to registration according to participant report and/or clinical determination * PRE-REGISTRATION: Sedentary except for casual lifestyle recreation defined as self-reporting no more than 90 minutes per week of moderate-intensity aerobic exercise within the last 6 months * PRE-REGISTRATION: Self-reported ability to complete assessments by themselves or with assistance * REGISTRATION: Age ≥50 years as confirmed via clinical determination * REGISTRATION: Able to provide medical record release to confirm eligibility * REGISTRATION: First, primary diagnosis of stage I-IIIa breast cancer as confirmed via clinical determination * REGISTRATION: Post-surgery and completed primary treatment (i.e., surgery, chemotherapy, and/or radiation therapy) 3-36 months prior to pre-registration as confirmed via clinical determination * REGISTRATION: No evidence of possible cognitive impairment as assessed using the Telephone Interview of Cognitive status (13-item modified version) (TICS-M; score \> 21) NOTE: Only individuals who pass the TICS-M during pre-registration will be invi…