The human spine must allow significant motion during such everyday activities as bending, lifting, looking overhead or emphatically shaking one's head no.  In addition to allowing this motion, the spine must withstand significant mechanical loads, in its role as a component of the musculoskeletal structure, and protect a major component of the central nervous system, the spinal cord, from mechanical insult.  The loads in the lumbar spine (low back) can range up to five thousand Newtons in some people for some activities.  This approaches half the weight of some small cars!
Sitting in one of my rocking chairs, one will immediately notice the relief on the lower spine - the lumbar area.  Your new rocking chair will cradle and support this area, and you will probably wonder "what took me so long to get one of these?" I never tire of the look on people's faces as they sit in one of my rocking chairs for the first time and experience this wonderful support and comfort.
I guarantee your comfort, or I'll refund your money including shipping.  I am that confident that one of my rocking chairs will fit you better than any chair you have ever experienced.