the exercises that help with most back problems ARE NOT the normal ones you do in the gym as a normal part of a routeen.....depending on what exactly your injury is normal gym exercises can make you worse, alot worse....
chances are if your doing anything that involves weights you arent doing the right stuff.....the exercises my personal physical therapist gave me to do to fix my back dont have me doing any weights other than the weight of my own body.....your targeting a completely different set of muscles for a back injury.....if you dont look like your doing yoga or some sorta dumb arse thing your prolly not doing the right thing