Rolfing, Rolfs, ACHE, KNEAD, and SPA are all terms related to the practice of deeply massaging. Rolfing is a type of deep tissue massage developed by Ida Rolf in the 1930s. Rolfs is a term used to describe a practitioner of Rolfing. ACHE is a term used to describe a dull or continuous pain. KNEAD is a term used to describe the act of pressing, rubbing, and manipulating muscles and other soft tissues. Lastly, SPA is a term used to describe a place where people can go to receive treatments such as massage, facials, and other body treatments. All of these terms are related to the practice of deeply massaging, which involves pressing, rubbing, and manipulating muscles and other soft tissues to relieve pain and tension.