Physical therapists frequently use spinal manipulation therapy (SMT) to treat spinal pain. However, the methods by which SMT exerts its effects are not well understood. The aim of this study is to assess potential changes in pain pressure threshold following both a cervical and lumbar spine manipulation in a single treatment session at sites local and diffuse to the site of manipulation application. This study will also attempt to determine if the order of the cervical and lumbar manipulation application impacts pain pressure threshold changes.