The spinal column is one of the body's main supports. The spine itself is divided into three sections: the cervical, the thoracic, and the lumbar spine. These sections are made up of interlocking vertebrae, which allow the backbone some flexibity.

Lumbar vertebrae are the strongest, they must support the weight of the upper body. Between the vertebrae are discs made up of cartilage that act as shock absorbers to prevent damage from sudden jolts. These discs have a tough, flexible outer case and a soft, jellylike center, and cushion and protect the vertebrae.