Primary outcomes include scar evaluations by the Vancouver Scar Scale and spectrophotometry. Secondary outcomes are composite measurements of shoulder morbidities, including numeric pain rating scale (NPS), shoulder range of movement and hand grip strength; arm function as evaluated by the Disabilities of the Arm, Shoulder and Hand (DASH-HKPWH) questionnaire; and quality of life as measured by the Functional Assessment of Chronic Illness Therapy - Breast Cancer (FACT-B). Outcome assessments at baseline, immediately after the 6-week program, and 3-month follow-up periods will be conducted by blinded assessors at the breast care clinic.