The Core Channel of the body can be see as flowing and glowing in three pathways from the perineum to the crown of the head. In meditation (or movement that uses the hands to guide the energy along the pathways), we can see energy traveling through these routes. They are also known as the great rivers that flow through the body. The sexual energy can also be brought up the channels and spiraled or wrapped around the organs or glands.
Massaging the points of the hands can bring relief to the associated organs and the channels and points in between. For instance, massaging the Large Intestine-4 point can ease issues with the large intestine, such as constipation or diarrhea. Also, the points of the large intestine meridian along the outside of the arm can find relief, particularly the top of the forearm at the elbow.
From Chi Self Massge, Mantak Chia: