Fascia is a connective tissue that forms a three-dimensional net throughout the body. It is composed of collagen fibers, fibroblasts, and ground substance. Fascia exists in layers - superficial fascia beneath the skin aids with insulation and cushioning, while deep fascia separates and surrounds muscles. Fascia is avascular but contains myofibroblasts that allow it to exert contractile forces. It transmits tension throughout the body to allow upright posture and movement through myofascial lines and trains. Maintaining proper hydration is important for collagen structure and fascial function. Myofascial release techniques can help improve fascia mobility and reduce pain.