tight glutes is a big factor for lower back as the glute criss crosses up into the lower back (right glute to left lower back and vice versa)
using a lacrosse ball to loosen tight muscles (works on other parts of the body especially the back up against the wall or on the floor) I find relieves lower back pain.
I use a lacrosse ball throughout my workout to release tension.
better than foam rollers.
it's accupressure so you will feel some pain at first (especially if you haven't done it before) and as the tension releases it feels much better.
when i've used it on my back between shoulder blades, on my traps,calves etc. ive almost fallen asleep its that good.