One of the most important things you can do for your lower back is keep your core strong and integrated with your spine.  I'll explain.  Have you ever seen a large sailboat?  Picture the mast on the boat. What is attached to it?  Riggings.  Lots and lots of riggings. If those riggings are not there, the mast on the boat falls over.  The mast can't support its own weight without all those lines attached to it.  Your spine is similar. The human spine, on its own, without anything attached...