Qigong is an ancient Chinese health care system that integrates physical postures, breathing techniques and focused intention. The word Qigong (Chi Kung) is made up of two Chinese words. Qi is pronounced chee and is usually translated to mean the life force or vital-energy that flows through all things in the universe.
Here is information from National Qigong Association.
Qigong has proved valuable to many breast cancer survivors both during and after treatment and is recommended by several breast cancer sources.
Here is an article from breastcancer.org