In reply to benky1979:
I can back up what Kingborris wrote. Having had an L4/5 Discectomy some 9 years ago i had to take a serious look at how i trainned and also how i lived my life in general. Substitute swimming for running, focus on core stability, bit of yoga and absoluely stacks of climbing!! For me it was all about reducing inpact, mainly through running. Spending less time sat at the desk, swiss ball when i have to though.
I remember how it was before surgery, pain,pain,pain!
Now it's Climb,Climb,Climb!!
Low impact activity like climbing is absolutely awesome for the ongoing good health of my back.
Waffled on too long there, but you get the picture.