i have had a several epidural injections over the years for non golf related back issues...there are defiantly some things you can do to lessen lower back problems from golf or life in general..
core work: planks,superman's,stability ball work etc
leg training: more specifically hamstring and abductor strength
stretching/rolling: a very precise and well executed stretching pre round/range program and roll...get a foam roller for pre play and at home..
diet and body-weight/composition certainly play a factor along with stance...the more narrow your stance the more stress the lower back experiences when rotating due to it increases the ROM at your core..
i can see were people find Tiger's "glute activation" comment as odd or funny..but it makes sense too me since i'm involved in training...what he means in normal terms is he gets tight from his IT bands(hips) around his rear end and down to his hamstrings...so that feeling when you make the turn to get a burger and it takes way too long..you get to the 10th tee box and you feel all stiff...you swing and snap hook one cause your lower body is tight...that is "glute non activation"..Tiger needs to stretch more period!!