TeleHealth Resistance Exercise Intervention to Preserve Dose Intensity and Vitality in Elder Breast Cancer Patients

Inclusion Criteria: * Women age \>=65 * Diagnosed with stage I-III invasive breast cancer * BMI between 18-50 kg/m2 * Scheduled to begin at least 10 weeks of neoadjuvant or adjuvant cytotoxic chemotherapy for curative intent * If enrolled in clinical chemotherapy drug trial, considered eligible if regimen includes an anthracycline or a taxane, unless the trial alters the chemotherapy agents/doses according to patient response (e.g.; I-SPY trials) * Self-reported ability to walk for 6 minutes and/or 2 blocks (with or without assistive device) * Ability to provide written informed consent. * Ability to understand, speak, and read English. This is because many of the study instruments used are not readily available in multiple languages. Additionally, site-based study staff, such as exercise physiologists, are not bilingual and not all sites have access to interpreters. Exclusion Criteria: * Following a therapeutic diet for co-morbid disease where the THRIVE-65 diet would be contraindicated as assessed by the RD * Engaging in 2 or more sessions of strength training exercise per week over a period of at least 3 consecutive months over the past year * Engaging in aerobic activity at a level that includes competitive events (e.g., marathon, triathlon, running races) over the past year * Presence of medical conditions or medications that would prohibit participation in an exercise program * Current use of weight-loss medication * Documented history of alcohol or substance abuse within the past 12 months * History of dementia