Ligaments surround the bony vertebrae to provide support. The ligament in the front of the spine is wide and strong. The ligaments located in the back of the spine are relatively thin and narrow. The following pictures illustrate the key principles of body mechanics. They form the foundation for the proper way all activities should be performed to prevent back injury.
Center of gravity is the point of balance between the upper and lower body.
The difference is to accommodate for anatomical structure with men generally having wider shoulders and women wider hips. It is very important to bend knees and lower oneself with a straight back when lifting. Lifting this way takes strain off of back muscles and enables the stronger leg muscles and arms to do the work. This can place tremendous strain on the back. Base of support is that which supports an individual's center of gravity.