Fascia is a network of connective tissue that surrounds and separates muscles and other structures throughout your body. Think of it as an internal web that provides support while allowing different parts to move in relation to one another. Much of its strength comes from collagen. Between some fascial layers, water-rich substances—including hyaluronan—help tissues glide. Some fascia is loose and flexible; other areas are thicker and built to withstand greater tension

Fascia is no longer just a “trendy” buzzword in the fitness world—it’s a scientifically recognized, body-wide connective tissue system.