Fascia is one of the most important body tissues most people never think about. It helps shape posture, supports muscles and organs, guides movement, and may play a role in why one area can feel tight even when the problem seems to start somewhere else. Picture peeling an orange. Under the bright outer skin, thin white fibers divide each section and help hold the fruit together. Fascia works in a similar way in the body. It wraps, separates, cushions, connects, and supports.