In in our subjects in college, we were thought about how to have proper mechanics. It is very important for everyone of us in order not to injure our body parts. Sitting correctly is essential, since the strain put on the spine and its associated ligaments over time can lead to pain, deformity and chronic illness. There were a lot of things, I only remember to have proper body mechanics when I already feel the pain in my back. I am not good in sitting up properly so I usually injure my back ligaments that results to back pains. There is a proper way on how to sit up correctly. Sitting upright, at 90 degrees, is the worst position for your back, as it strains your back unnecessarily. You should lean slightly back, at an angle of about 135 degrees.