A massage therapist is a person who practises therapeutic massage.
The term massage therapy (colloquially known as massage; massage is also the term describing the individual treatment session) covers a group of modalities and application methods. Roughly it is estimated there are 80+ different types. With every one, the therapists press, rub, and using various techniques press on and manipulate the muscles and other soft tissues of the body, often with changing pressure and movement. Generally the hands and fingers are employed, and with certain types may use their forearms, elbows, or even a foot or two. Basically the aim is to relax the soft tissues, increase blood flow rate and oxygen supply to the massaged areas, warm them, and reduce pain.
Massage therapy treatments go for half to one hour; but can range from a quarter of an hour to maybe even around two hours. For some conditions (especially chronic ones), therapists recommend a series of appointments. It is usual for the massage to be conducted in an environment that is as calm and soothing as possible (by using low soft lighting, soothing music background, and some type of aroma).
Massage should be no risk to any body however a small number of serious injuries have been reported probably cautions were not followed or a massage given by an untrained person or the recipient has some sort of existing injury or trauma or affliction like cancer or have fragile skin and body or if in the latter stages of pregnancy.