I hope it's something that can possibly be cured via repetition on the bike. I'll be the first to admit that I absolutely cannot stand lifting weights. To give an idea, I've had two knee reconstructions. Both times I stopped going to physical therapy after the first session. I just can't do it. Props to those that can do gym work, though.
I was diagnosed with a slightly herniated disk in my lower back about a year and a half ago; however, it only truly bothers me if I do something strenuous like move furniture (or climb hills on my bike).