The goal of this clinical trial is to learn if Baduanjin exercise could be adopted by breast cancer survivors and improve their upper limb dysfunction. The main questions it aims to answer are:
* Does Baduanjin exercise improve upper limb dysfunction among breast cancer survivors?
* What problems or adverse events do participants have if they adopt Baduanjin exercise to improve upper limb dysfunction?
Participants will:
* Adopt Baduanjin exercise following an evidence-based intervention protocol
* Report their exercise frequency, length, and unexpected symptoms
* Receive three times assessment and follow-up every week