Your spine is supposed to have 3 natural curves to it: concave in your lower back, rounded in your trunk and concave in your neck. This natural S-curve is created by the base the spine sits on called your pelvis. Many muscles from your hips, back and trunk attach onto your pelvis and can alter its position. The body is built for structural stability with optimal mobility. Learning how load is distributed through your body can help you understand your pain and rehabilitation. See the video for more detail.