PSO-SPINE®The PSO SPINE is perfect for massaging and releasing muscles to the right and left of the spine. Many demands are placed on your spine. It holds up your head, shoulders, and upper body. It gives you support to stand up straight, and gives you the flexibility to bend and twist. When your muscles are tight around your spine, this can squeeze your nerves and cause issues in different parts of your body. The PSO SPINE is a self massage tool that can help