Chi Exercise Machines have been around for almost 25 years now. Originally invented in Japan in the late 1980's, they arrived in the West via Taiwan in the early 1990's.
They became known in the West as "chi machines" when people realised a distinct energizing effect was being stimulated - experienced by most people, from their very first session, as a tingling sensation.
The Chinese identified this as a heightened flow of chi energy - the subtle energy that defies scientific explanation but seemingly keeps us humans ticking at a more fundamental level than blood, bones and flesh.
The original machine that was designed and engineered in Japan was marketed in the West as the "Sun Ancon". Later the Taiwanese company that were selling them registered the generic term "chi machine" as a Trade Mark - "The Chi Machine". As other manufacturers launched improved and cheaper versions of the original Sun Ancon onto the market, it became more and more confusing to talk about "chi machines" because of the Trade Mark status of the original.
For this reason this class of passive exercise machines has become more generally known as "Chi Exercise Machines," and this is how we refer to them on this site.