Healthcare has always undergone change. Old diseases disappear or are conquered; new ones take their place. The Harvard Medical School Guide to Tai chi contends that the Western model of medicine may have many acute problems under control; however it seems that there are not enough solutions for managing chronic illness. Conventional medical science now shows what Tai Chi masters have known for centuries: regular Tai Chi practice leads to more vigor and flexibility, better balance and mobility, and a sense of well-being. Cutting-edge research from Harvard Medical School also supports the long-standing claims that Tai Chi also has a beneficial impact on the health of the heart, bones, nerves and muscles, immune system, and the mind. This research provides fascinating insight into the underlying physiological mechanisms that explain how Tai Chi actually works and how it can enhance work productivity, creativity, and sports performance.