Understanding 'knots' in your muscles

Muscles can stick together and create knots because of inactivity, dehydration, and injury. Your muscle fibers adhere to each other because the fascial (soft tissue) layers that surround and weave between them stick together. As your massage therapist rubs the muscles and soft tissues under your skin, this friction causes your fascial layers to let go of each other.

Source: http://www.massagetique.com/blog/injuries-...