What is happening when an osteopath manipulates my back?

When an Osteopath manipulates your back you will hear a click. The click is due to the surfaces of the joint coming apart creating a potential vacuum. The aim of this is to separate the joint surfaces, which leads to increased movement between the bones that make up the joint, and causes the muscles surrounding the joint to relax. You may feel a little twisted and stretched as the Osteopath prepares you for manipulation, but it does not cause pain.