The concept of body-subject is the term used by philosophers to describe the human body, as opposed to just body material. German in particular, Leib (the flesh) is opposed to Korper (body).
Indeed, the body-subject refers to the human way of living her body inhabited by a conscience and with intent, while the material body is only inanimate matter.
Thus, the body of an individual material body is in opposition to a living body.
Fichte, Hegel and Merleau-Ponty have developed the body-subject concept.