The sacrum is a keystone in the body because of its relationship to both the lumbar spine and the pelvis. If the pelvis moves one way, the spine reacts. The problem here is that we need to keep our eyes and ears level to maintain equilibrium, so our body will contort however necessary to make that happen. In this way, a misaligned pelvis can cause our spine to make some pretty funky shapes. I like to massage on and around my sacrum as a way to stimulate ease and awareness through this important keystone bone!!