Deep tissue massage therapy focuses on releasing fascial adhesions. Fascia is  a three-dimensional web of connective tissue that surrounds, supports and penetrates all of the muscles, bones, nerves and organs. Deep tissue massage works layer by layer through connective tissue and muscles down to the deepest accessible layers to change posture and create freedom of movement by releasing fascial adhesions and chronic muscle contracture. Injury, chronic poor posture, chronic or acute inflammation and repetitive motions all contribute to scar tissue formation and adhesions in muscle tissue. Licensed massage therapists who utilize deep tissue techniques use their fingers, thumbs, fists, forearms and elbows to stretch each muscle and fascia layer. 

Contrary to popular belief, deep tissue massage shouldn't be painful. Well-trained licensed massage therapists work very slowly, within the client's tolerance, to stretch muscle layers without causing pain or damage. You may experience a little soreness afterwards, but you should feel better, not worse, after your massage.