Regulating the Mind by watching the Tan-t'ien 丹田

A third method of regulating the mind is to focus the attention on the tan-t'ien, which is a point located below the navel. The tan-t'ien is not an organ, but a center of psychic energy similar to the Indian chakras. This method is best employed when your breathing has naturally descended to the abdomen. The technique consists simply in mentally following the movements of the tan-t'ien as the abdomen moves in and out as a natural consequence of breathing. This method is more energetic than the methods of breath counting or following, and should be used only after gaining some proficiency in those methods. In any case, the method should not be forced.

《TSO-CH'AN》p. 0013-0014