Whether you are standing,
sitting, sleeping, working, or relaxing, your spine is most
comfortable in what we call a neutral posture. Neutral postures
are positions about halfway between full bending and arching.
Your neutral spine has three natural curves: an inward curve at
the neck (cervical lordosis), an outward curve at the upper back
(thoracic kyphosis), and an inward curve at the low back (lumbar
Neutral spinal curves vary in shape from person to person. They
can also change - sometimes for better, with exercise and
training; sometimes for worse, with aging, injury, disease, or
poor posture habits.
The amount of curvature in
your spine when you are in a neutral posture determines your
support requirements. A spinal support's curves should be deep
enough to support your particular curves without pushing beyond
your neutral postures. It should feel natural. You should not feel
too arched; nor should you feel unsupported, as though there were
a gap between you and the support.