The back provides support for the head and the trunk of the human body. It's one of the strongest areas of the body and allows for a great deal of flexibility and movement. A key area of the back is the spinal canal, which provides nerves to the rest of the body. Because of the spine, injuries to the back can cause pain in other areas of the body.
The muscles in the back connect the structures in your back with your shoulders, neck and hips. Back pain is very common in adults, and muscle strain is one of the lead causes of back pain. Your back is an important part of everyday movement because it supports your entire body. It's prone to injury from sports, incorrect posture, and muscle spasms.