I herniated a disc in my spine a few years back which impacts on my sciatic nerve. Needless to say in a lot of pain each day and mobility bad. Surgery not a option due to other health issues. However, since purchasing Backballer i have notice. a big difference in my mobility. I have puchased much more expensive device which have had no effect on this condition. Well done Noel and Backballer team on such a excellent product.