An active torso support includes multiple force applying elements for applying force to selected regions of a torso of a subject, to reduce or prevent injury or discomfort, under the control of control circuitry on the torso support. Target regions for application of force are selected by detecting the position of a landmark in or on the torso of the subject relative to a portion of the torso support, and selecting one or more force applying elements closest to the target region. Force can be applied according to spatial or temporal patterns, selected in response to user input or detected motion or activity of the subject. Related devices and methods are described.