The body has many systems designed to do various tasks. The circulatory system moves blood, the nervous system carries the nervous impulses to the muscles and sensory impulses back to the brain. The energy circulatory system is the system by which the body is theorized to carry Ki energies to various points in the body. It doesn’t have a physical substance, it has a definite path, but this path does not appear to be dictated by anything in our physical realm. Most pressure point techniques are designed to affect the nerves, muscles, and other physical aspects of the body, but a few advanced ones are designed to work directly on the energy circulatory system. However only advanced pressure point techniques can affect the energy circulatory system and knowledge of those techniques are extremely limited.