Just an observation of myself. I am 50 in 1 months time, had a prolapsed disc remove back when I was 24 years old [blew it doing some pretty hard core non-MA training] Now I don't know if your problem is muscular or spinal, but until I started back at MA, I was very stiff in the back, pain and lacked mobility. Now I can "touch my toes" again, have heaps more flexibility, in short, I'm very happy with the state of my back and have no doubt it is all thanks to MA. Core strengthening and flexing is what has done it for me. Go see a Doc, find out whats going on, because MA should be helping, not creating problems. I chose Karate, partly because it is more stand up, with less throwing etc. Good luck!