Weightlifting manikin spine force in human body bending lifting model demonstration figure correct and wrong liftingthis lifting manikin displays clearly the conditions of the spine during right or wrong lifting. if the manikin lifts the load correctly, which means it bends the knees and straightens the back, all vertebrae stay together as one and the load is spread on the whole vertebra. if the manikin lifts the load with straight legs and bends the back, the spine is bent apart and clefts appear between the vertebrae. the patient can clearly see that the load is pressing on the front part of the vertebra which can cause disc damages. a valuable aid for each practice.base with illustrated lifting instructions for ease of use.product dimensions5-1/2 inch x 9 inch base16-1/2 inches tall when standingnote1-2 cm measurement error is a reasonable range, due to the manual measurement methods.please be reminded that due to lighting effects, monitor's brightness/contrast settings etc, there may be a little difference in the color of the pictures and the actual item.