An active torso support that controls force applied to one or more portions of a torso of a subject in response to detected posture of the subject is described. The active torso support includes one or more elements for applying force to the torso of the subject, positioned on the torso of the subject by a positioning element, which may include a belt, for example. Posture of the subject can be determined at least in part from a height measurement. In some aspects posture may be determined in part from additional measurements, e.g., inclination or force. For example, the torso support can be a back brace for providing support to the back of a subject to limit or prevent injury or discomfort.
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