partially degenerated disc at L4-L5, 42 years old. it's pretty scary at 1st until you learn to deal with it. i was told i'd never run again, i trophied at a 5k & finished a half marathon easily. i was told i'd never be able to ride a bicycle again, i raced them for years, won a few trophies. dirt bike riding hardly bothers it at all. the key for me, as for some others above, was finding the right physical therapist. i do my exercises every day, make sure i sleep right, use a special pillow that cost $100 (for arthritis in my neck from bike wrecks, but it also helps my lower back). every few years i really mess up my back doing something, the pain is pretty bad, then i call my neursurgeon & ask for a medrol dose pack & it's gone in a couple of days.there's a girl in our club who just had surgery on the same disc, had a fusion, now she's riding as hard as ever. don't despair!