First, most low back pain is caused by a mechanical deformation, such as an arch in the low back. Second, if the low back pain is caused by non-mechanical factors (such as spondyloarthritis) then having the pressure of the foam roller directly on the spine could exacerbate the condition. Third, areas the foam roll is used should have bony protection for organs. For example, when rolling the chest, there is no danger to the heart because the rib cage provides adequate protection. In the low back, there are the kidneys and the liver, which have little to no bony protection (Newton, 1998). While they may be protected by large muscles, it is still considered an endangerment site, especially when using body weight compression across such a large object.