SITTING FURNITURE

Sitting furniture (100) comprising a seat (110), a lower leg support (120) and a chest support (130). The invention is characterised in that the seat (110) is arranged to support the posterior thigh (11) and/or buttocks (12) of a seated user (10) such that the femur bone (13) of the seated user (10) is downwards inclined in the anterior direction at an angle of at least 40° downwards in relation to the horizontal, in that the lower leg support (120) is arranged to support the anterior side of the lower legs (14) of the seated user (10), and in that the chest support (130) is arranged to support the chest (15) of the seated user (10) in a forward leaning position of the seated user (10) such that the third lumbar vertebrae body (16) of the seated user (10) is arranged in a support plane (150), which support plane (150) is perpendicular to the sagittal plane of the user and in which support plane (150) the respective pivot point (17) of the seated user's (10) hip joints and the respective pivot point (18) of the seated user's (10) shoulder joints are also arranged when the posture of the seated user (10) is symmetric about the seated user's (10) sagittal plane.