Demonstrates how the vertebrae of the human spinal column react when heavy objects are lifted correctly and incorrectly. The manikin will lift a weight from either of two position. If the correct posture is used, the spine is undistorted (no spaces between the vertebrae). The incorrect posture causes obvious visible strain to the simulated vertebrae. The rugged base features anatomical illustrations of the effect on the spine. Designed by a physical therapist. Free booklet entitled "Safe Manual Handling" is included. Size: On a 5-1/2" x 9" base; 16-1/2" tall when standing.