Slow Jogging for Breast Cancer Survivors

Inclusion Criteria 1. Female breast cancer survivors aged 20 years or older. 2. Histologically confirmed hormone receptor-positive breast cancer (Stage I-IV) and considered suitable for exercise intervention by the treating physician. 3. Completed primary cancer treatment (surgery, chemotherapy, or radiotherapy) within the previous 12 months; participants receiving ongoing anti-HER2 targeted therapy and/or endocrine therapy are eligible. 4. Able to independently operate a smartphone and willing to install and use the study application. 5. Self-reported sleep disturbance within the previous two weeks, defined as a Single-item Sleep Quality Scale (SQS) score ≥ 6. 6. Willing to participate and provide written informed consent. Exclusion Criteria 1. History of cancer treatment-related cardiovascular complications or judged by the treating physician to be unsuitable for exercise. 2. Musculoskeletal disorders affecting lower-extremity function (e.g., plantar fasciitis, knee osteoarthritis, ankle degenerative disease) that limit exercise participation. 3. Currently participating in another structured moderate- or vigorous-intensity aerobic exercise program (≥3 sessions/week, ≥30 minutes/session for ≥3 consecutive weeks). 4. Any other medical or psychological condition judged by the investigator to interfere with safe participation or completion of the study.