Saddle fit issues have similar physiological factors with bed sores. Skin and muscle tissue require a constant intermittent flow of blood to remain healthy. Exchange of oxygen and waste products occur in the capillary beds. Excessive pressure causes the capillary vessels to collapse. Capillary closing pressure leads to unhealthy tissues. When the back of the horse works correctly and is free of pain, forward motion becomes effortless and supports the rider. When he uses his back incorrectly, he will have rough gaits, difficulty moving forward, and his hollow back will cause his neck position to be high and stiff.