Did you know that your posture is a result of your nervous system's approach to handling a load? By default, nature gives us slight curves in the spine. They are big enough to act like a spring and small enough to keep us straight. Gravity constantly tries to increase those curves. If your nervous system lets go in the upper part, you become hyper-kyphotic. If it lets go in the lower part, you become hyper-lordotic. A combination of these two is also possible, resulting in a hyper-kypholordosis.