EXERT-BCH Exercise Regimen to Improve Muscle Mass After Treatment of Breast Cancer

Inclusion Criteria: Age 20-89 years * Women with a biopsy proven diagnosis of ductal carcinoma in situ or invasive carcinoma of the breast * Women must have undergone treatment for breast cancer, including one or more of the following: surgery, radiation therapy, chemotherapy, immunotherapy, or hormonal therapy. Women undergoing active chemotherapy are not allowed on study. Immunotherapy or targeted agent usage is allowed. Exclusion Criteria: * Any current treatment with cytotoxic chemotherapy for breast cancer * Inability to safely engage in group sessions of resistance training as deemed by study PI * Severe arthritic, joint, cardiovascular, or musculoskeletal condition deemed by PI to be unsafe to engage in resistance training