A posture is the static or dynamic body position and all that goes with it. It is a correlation between the incorrect posture and movement disorders. Various strenghts act on the posture. An External force is a gravity, a working of instruments … An Internal force is a body stabilization, a postural reactibility… It is a long-acting activity of the body muscles. The central nervous system controlling this stabilizing function of muscles. A cerebral palsy
is an examples of movement disorder in damaged central nervous systems.