Your organs are in perpetual motion. Breathing, walking and stretching all create internal movement.  In a healthy body the fluid movements are transmitted through the fascia to other structures. Organs lose mobility due to physical trauma, surgery, infection, diet, posture etc.. The restrictions lead to compensation, tension and irritation. An example would be scar tissue around the lungs that creates the ribs to move differently. This creates a pull on the spine and pain in the neck and mid back. The result is limited shoulder movement.  Visceral manipulation is a gentle manual therapy focused on releasing compensations and restrictions related to the internal organs.