Plyometric Strength-Endurance Exercise in Breast Cancer

Inclusion Criteria: * Women aged 18 years or older. * Prior diagnosis of breast cancer. * History of mastectomy, including unilateral procedures, total breast surgery, or breast-conserving surgery. * Completion of postoperative chemotherapy or radiotherapy, when indicated. * Absence of contraindications for physiotherapy or therapeutic exercise. * Willingness to voluntarily participate in the study. * Ability to understand and sign the informed consent form. * Availability to participate in the training program for the entire intervention period (approximately 12 weeks). Exclusion Criteria * Participants will be excluded if any of the following conditions are present: * Active metastasis to other organs or tissues (e.g., liver, kidney, lung, brain) or stage IV cancer that prevents safe participation in the therapeutic exercise program. * Current diagnosis of cardiovascular, respiratory, neuromuscular, or musculoskeletal diseases that contraindicate physical exercise or impair safe completion of the program. * Major surgery within the previous 6 months without medical clearance to resume physical activity. * Cognitive impairment or mental health conditions that limit comprehension of instructions or safe engagement in the intervention. * Current pregnancy. * Lack of medical clearance for moderate-to-vigorous physical activity (as indicated by a medical certificate specifying the duration of the restriction and the conditions under which exercise may be resumed).