A chair includes a seat and a back rest, both of which pivot about respective axes between first and second positions thereof about parallel axes of rotation. The seat's second position is inclined relative to a first seat plane defined by the seat's first position. The backrest's second position is essentially parallel to the first seat plane such that the chair switches between seating and support configurations. In the seating configuration, the seat and backrest are their respective first positions such that the chair accommodates a seated person. In the support configuration, the seat and backrest are in their respective second positions such that the chair accommodates a person's chest on the backrest's rear face.
