Chi and Pose are different processes but with an underlying philosophy that great benefits can be obtained in running, and reduction in injury, through adopting a style of running that emphasises the position of the foot and leg in a "neutral" state.
Body weight is smoothly transferred from one foot to another through concentrating on a mid foot strike with little toe off or backlift (and certainly no heel strike!!) making it, it is claimed, a more efficient running style.
there are long standing threads on the Forum on both.