Yeah that's true. And I don't know your situation. But I do know that I have been through the normal medical establishment, and I've seen what modern medicine has to offer. And it's missing a lot. We're all different, but we have similar design flaws and physiology.
Here is the single most important thing to keep in mind: Those discs have no direct blood flow.
They're designed to move fluids in and out though the natural pumping action of walking. If you're stationary, they dry up. The most damage occurs in your 30's when they're still full of fluid and the fibers are getting weak. It's so easy for someone in poor spine health (most of us) to twist and bend and shoot the contents of that disk out the back of the disc. Often it's only some of it and most only part way (bulging disc) but you can lose the anulus too. And that leaking disc causes inflammation, compressed nerves and back spasms. It hurts. In some cases (like mine and probably yours) it causes sciatic pain, nerve damage and muscle weakness. It makes you even less mobile which just cements the problem and for most folks is the beginning of the end.
If you hang over the ball it puts that area in tension which takes pressure off the structures and allows you to strengthen those muscles that were weak to start with and have become atrophied due to pain and immobility. Just lift your arms and legs (you can attach weights to them or not) while you're on that ball for 15 minutes a day. It won't seem like much and you'll wonder why you're doing it. Give it a few weeks and you'll be ready to add brisk walking or even better an elliptical to your workout. The idea is a smoooooth bouncing motion. This rehydrates the discs. they heal slowly, you have to give it time, but it does work and any person who is not getting this kind of exercise can be improved dramatically if they'll put in the time. Trust me. try it. What do you have to lose.
But I do luv both Nathan/Jo V much and want to spend all your monies for them to see more of the World 
