Fascia is a special type of tissue called connective tissue and as the tissue name suggests its primary role is to connect different areas of the body. Fascia has an important role in helping us to understand how the body moves as a result of such connections.
Unfortunately many traditional anatomists removed the fascia when they were dissecting human bodies and as such the simplistic view that each muscle has an individual action based on where it attaches to bone is still a common misnomer. What really happens is that the body is connected along different pathways via the fascia, and when we move we shift all of the tissues that create this connected pathway. These pathways extend from head to toe and can help to explain why we often find that the true cause of a problem is not where we feel pain.