In reply to BlakeyDerbyshire:
With the caveat that "your mileage may vary", I'll tell you what fixed my L3/L4 prolapse, which was giving me such serious pain around 10 years ago that I had to roll out of bed in the morning and get up on my hands and knees.
Two things: pilates, and some other core exercises, and stretching, particularly hamstrings. Oh, posture as well...three things!
Pilates/core - the logic here is that you should be using your core muscles far more in any number of tasks, like bending down to pick up a screaming baby! Without use of the core muscles, far more of the strain is passed to the back muscles, with the attendant stress/spasm/eye-watering pain I am sure you are familiar with
Stretching - an immense amount of stress is transmitted from your feet when you slap them down on hard pavements (or fall off boulder problems...). The more flexible your tendons, especially your hamstrings, the less is transmitted to your lower back.
Posture - I used to stand a bit like a Neanderthal...bad! You can check the right posture by standing against a wall, you should be able to stand with both your heels and the back of your head touching it. Assuming you have some sort of bum, your back won't touch but should be parallel to the wall. So, bum in, core muscles engaged. It needs work, a lot of work. before this becomes natural, and I find myself slipping into old habits, especially when tired. However, again it redirects stress away from that lower back, and has the added benefit of increasing your height by an inch or so.
All of this stuff needs training and your hard work, but believe me it's worth it. I have been pain free for many years now, and falling off highball problems onto mats is no problem, whereas before I shuddered to think of even coming off 6". Good luck!