Since the lumbar spine is connected to your pelvis, this is where most of your weight bearing and body movement takes place.
Typically, this is where people tend to place too much pressure, such as when lifting up a heavy box, twisting to move a heavy load, or carrying a heavy object.
These activities can cause repetitive injuries that can lead to damage to the parts of the lumbar spine.
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The lumbar spine's shape has a lordotic curve, shaped like a backward "C." If you think of the spine as having an "S"-like shape, the lumbar region would be the bottom of the "S." The vertebrae in the lumbar spine area are the largest of the entire spine.