A normal lumbar lordosis is essential for a lower back to perform in a healthy, normal, painless manner.
A lumbar lordosis is not something you are born with. The lower back lordotic curve starts to develop at the time of birth. Actually, at the time of birth your spine possesses one curve... a "C" shaped curve with the convex side toward the back. This is called your primary curve.
It is when as an infant you start to develop secondary curves, one in your neck (cervical) and the other in your lower back (lumbar).
These secondary curves form in the opposite direction of the primary kyphotic curve found in your thoracic spine. The secondary curves are called a cervical lordosis and lumbar lordosis referring to the neck and low back respectively.
The neck will form a cervical lordotic curve and your low back will develop a lumbar lordotic curve.
Ideally the transition from one vertebral area to another or from one spinal segment to another should be gradual and smooth. When this is present you find healthy joints and discs, muscle balance and normal function.
As we grow into adulthood the spinal curves should develop into normal curves that will, for the most part, determine our general human posture.
It is essential that a proper, healthy lifestyle and habits be adopted and encouraged during your early formative years in order to develop a normal healthy, structurally sound and functioning spine by adulthood.
If an abnormal posture is allowed to develop and exist in and throughout your pre-adult years and persist into adulthood, then this postural abnormality will eventually manifest dysfunction and pain. Like the old proverbial statement says..."as a twig is bent so grows the tree."
It is far easier to correct an abnormal posture before adulthood that it is in later life. Correcting bad posture should not only be for a visual, cosmetic reason but for a functional and disease preventive purpose as well.
We all know the importance of a straight and aligned automobile how it can influence its performance and longevity. Do you not think ta strong and aligned posture is not just as important? No...
...it is far more important.
If your car wears out you can always purchase a new one; but, you are only given one body at birth. If it wears out too soon...you can't get a new one.
When you find hyperlordosis or hypolordosis eventually what will ensue is facet joint and disc degeneration, nerve compression, poor muscle strength and function, and eventually chronic pain and disability.
Your spine, just like your entire body, was designed and meant to last a lifetime...not a day longer. You will always have a certain amount of expected normal wear and tear and with it eventual degeneration. But, with proper care, this process should proceed with minor discomfort and dysfunction.
You are designed to last a lifetime...no longer. Your body parts should wear out when life expectancy is reached. Even Jack LaLane, who probably did most things right, eventually needed a hip replacement as his life approached its end.
With proper musculature balance you will have proper lumbar lordosis. It is the pull of the muscles that keep us aligned.
The hamstrings have a constant pull on the pelvis in a backward manner while you're anterior hip flexors pull the pelvis in a forward fashion. This is a constant balancing act throughout the day.
When one muscle or muscle group is relatively stronger than the other you have abnormal pelvic tilt and abnormal posture.
The key is to have both muscle groups strong, with adequate endurance and flexibility to permit proper function throughout the day. Then they need a rest period (nighttime) to recuperate and regenerate in order to permit normal function the next day.
If either your hip flexors or extensors (hamstrings) are overdeveloped, impaired or not rested properly, lack strength, flexibility or endurance, relative to each other, you will have abnormal function and structural stress and abnormal lordosis with resulting injury and pain.