Automatic body positioning exercise support system

A device for positioning a user's torso to achieve biomechanically advantageous positions during strength training, comprising:

• a support structure configured to be removably coupled to, integrated with, or form at least a portion of a support surface of a weight training apparatus, the support structure comprising:
• (a) a torso support surface extending in a first plane along a longitudinal axis;
• (b) a pair of shoulder support surfaces extending laterally from opposite sides of the torso support surface in opposed directions along a transverse axis orthogonal to the longitudinal axis, each shoulder support surface being defined by a first offset from the first plane toward a base plane of the support structure, the first offset monotonically increasing along the transverse axis relative to increasing distance from the longitudinal axis such that, upon application of force by the user, scapulae of the user are automatically depressed and adducted until shoulders of the user are supported by the shoulder support surfaces;
• (c) a lumbar support surface distal to the torso support surface, the lumbar support surface being displaced from the first plane toward the base plane by at least a second offset;
• and
• wherein the torso support surface is configured to support the user's torso, the lumbar support surface is configured to support a posterior lumbar region of the user, and the shoulder support surfaces are configured to support the user's shoulders.