Inclusion Criteria:  Having a breast surgery indication with a diagnosis of breast cancer Having stage 1-2-3 breast cancer Education level to be at least literate To be in stable clinical condition Not having any other disease that will affect their physical and psychosocial functions Being good at cooperation Referred by the relevant surgeon and no contraindications for early postoperative physiotherapy  Exclusion Criteria:  History of previous breast cancer surgery Concurrent bilateral breast cancer and/or surgery History of shoulder surgery Preoperative shoulder dysfunction Upper extremity deep vein thrombosis BMI>40 kg/m² Use of an assistive walking device Stage 4 metastatic cancer All conditions that require close monitoring during exercise (such as uncontrolled or unstable cardiovascular disease or diabetes) cognitive impairment