Hello! I have quite a weak lower back after a mountain bike accident a few years ago. It tends to get really sore after doing a days hard work and sometimes I put it out quite badly. What is the best way to build up my core? Would it be best to see an expert before starting to exercise it in anyway? I did Pilates for 6 weeks and that seemed to help but then work took over my life again! Any advice would be very much appreciated.