Here is another excellent book on QIGONG; Miracle Healing From China by charles T. McGee M.D. with Qigong master Effie Poy Yew chow, PhD. I took a course I took a course from Effie here in the CXomox Valley 10 years ago and have been doing it ever since.
As Effie explains it, Qigong is the forerunner to Tai Qi and more people do Qigong in China. You have your choice in China to be treated for Parkinsons with western medicine or Qigong – both taking place in a hospital setting. Effie also runs the Qigong Institute, East West academy of Healing Arts in
San Francisco. She is an amazing lady.