The body is a series of kinetic chains, where any motion is felt by all cells in the body.  Proper posture allows for more efficient use of muscles and less stress on joints, increasing performance and energy levels and reducing the development of pathological conditions.
Altered posture results from injury as well as bad habits.  Damage to muscle and fascia causes restrictions in normal movement patterns, which the body attempts to override with a compensation pattern to allow the movement to occur.  This results in a muscle imbalance or other soft tissue dysfunction.  

Because deviations in one region of the body create compensation patterns in other regions, a deep understanding of anatomy and kinesiology is needed to interpret altered motion.  The therapist’s trained eye will decipher biomechanical imbalances and compensations, and employ techniques to return the body to its optimal position in space.