Using weight lifting belts is a great way to prevent back injuries as a good belt provides added support. It helps keep your spine in place so that you can pack on more pounds without risking injury. It also reduces forward, backward, and side to side bending of the spine, creating more of a need to generate power from your legs, which is the whole point of barbell squats and deadlifts. The best weight lifting belt for a bad back will definitely provide some relief.