If mental state influence physical conditions, where does tai chi play a role?

If mental states affect physical conditions, and researchers don’t know how it happens, then how can the cause/effect relationship be proven? As Stephen Locke, MD, states in The Healer Within (1986), “‘Knowing’ that one’s state of mind influences one’s body does not prove that it does.” In his book he talks about the trend in research to discover how the mental states affect the central nervous and immune systems, thus our health. Read More …