It utilizes focus, tension, and relaxation with concentration of the heat that surrounds the body.
Earth Deals directly with the body and is both consolidated and restrictive.
The sensations are of the components of the entire body and the impermanence of food. Air Deals with the mind and spirit and represents both creative and destructive knowledge. Water Deals with the self and is both receptive and impenetrable. Ether Deals with all the laws of life.