PSO-BACK®The Pso Back is a highly innovative self massage tool to help release muscle tissue and trigger points which surround the lower spine and reduce your ability to rotate, flex, and extend the spine creating undesirable stiffness. Losing the natural curvature of the spine spells disaster for anyone. The Pso Back uses hard nodes mimicking a therapists' thumb in combination with a gentle curve, which allows you to release muscular tension, decompress, and