Posture is a term used to describe a position of the body or the arrangements of body parts relative to one another. Ideal postures are those assumed to perform an activity in the most efficient manner utilizing the least amount of energy. All activity begins with a posture and ends with a posture. The relationships between body parts can be controlled voluntarily but to do this would require too much concentration. During normal functioning one's postures and adjustments to postures are automatic and occur quickly.