Spinal curves provide mechanical counterbalance to the loads the body must carry.
Example
- The rib-cage adds weight to the front of the body in the area of the mid and upper back.
- The thoracic spinal curve is in the direction opposite of the rib cage, at the same spinal levels as the ribcage.
- In this way, the demands placed on the spine by the weight of the ribcage are neutralized by the thoracic curve.

