Chi energy unlike spirit energy is best discribed as simply "raw force". Chi mainly focuses on physical strength and enderence. Chi Fighters always train their bodies so that they can weild their energy better. As one would expect, Chi fighters are more stronger then spirit warriors. However because their power is mostly based on physical force alone, they lack the natural flow, as such they cant control any elements. Instead of having a spirit awareness, chi fighters must rely on their instincts in order to get an upper hand in combat. It's not wise to match brute force against a chi fighter because their power raised from years of training, can easly overpower just about anybody. It's very difficult to match strength with a chi fighter.