Robin Hood is a story where the hero ‘robbed from the rich to give to the poor’. I think of movement dysfunction in the same manner. If a hip is stiff and unable to rotate it will ‘rob’ that motion of rotation from somewhere either above or below itself. If the hip ‘robs’ rotation from the low back then there is a high probability of creating dysfunction. Some literature suggests disc tears happen with rotation > 5 degrees between motion segments in the low back.
Hopefully by having a general understanding of movement responsibilities in the body we can avoid the ‘Robin Hood’ scenario and avoid movement dysfunction and subsequent pain.