Each and every time we move, we depend on the coordinated work of muscles to hold one area of the body steady so that another area can move efficiently. Every part of the body (musculoskeletal system) is connected to one another, either directly or indirectly. In the field of biomechanics this relationship is called a kinetic chain.

If one area of the body is not mechanically stable or does not move properly, it will affect movement at other areas of the body along the kinetic chain. When this occurs it is sometimes referred to as a kinetic chain disorder. For example, instability of an ankle with pronation can place abnormal stress upon the knee, hip and low back. As another example, abdominal muscle weakness can resulting in an increased forward curve (lordosis) in the low back which subsequently effects the posture and movement of the mid back and neck.

The core muscles of the human body commonly describe the lower torso and pelvic region of the body. The primary core muscle groups include the abdominal muscles, the gluteal muscles and the back muscles. The center of gravity of the body lies just in front of the lumbar spine (low back) within the core region. The core region of the body therefore strongly influences the spine and extremites. The core muscles are responsible for maintaining stabilility of the spine and pelvis while standing and during movement. The term "stability" refers to the capacity of the body to maintain and/or return to a state of equilibrium. Core stability is required to prevent injury to the spine. Most Americans will experience a significant episode of low back pain during their lifetime. Many of them are predisposed because of core muscle deconditioning.

Good core stability makes it easier to perform physical activities because the muscles of the pelvis, low back, hips and abdomen work together efficiently. Weak core muscles leave you susceptible to abnormal gait, poor posture, low back pain and muscle injuries.