I have the same problem you do. I have a recurring fracture to L5 in my back that will never heal---it refractured in the same exact spot it fractured previously. I was told to take about 6 months off--do absoultely nothing and that doing so would help it to start healing. I also saw a sports physcial therapist, and they gave me some exercises to strengthen the muscles/ligaments/tendons that are around the area to help support it.
Like BlairBob said, I suggest seeing a sports doctor or physcial therapist to get some exercises to help you strengthen the area around it, but I would recommend taking the time needed to heal before beginning. The fracture should heal with rest--no bending or jerking movments. I was put in a back brace (the first time around) for 12 weeks, which kept me from bending, and i was also out of the gym (of course).