Posture when wanding is very important as Larry suggests, however, I would go one step further and ensure that the wand you are using works well with your height.
I believe that some of the much newer wands, you don't "scrub" so much with them anmore which should also relieve a lot of back problems.
I have an old "S" bend wand that I got from Gary Bethel about 15 years ago that is still in top condition.
The "S" bend both at the top and bottom are much sharper than the normal wands, and it is also only about 5' in length overall.
I stand upright when using it, little or no bending at all.
I also have Green Gildes on it.
Ron, what's a "wobble chair" ??
Is this similar to an "Abdoer Twister".??
Shorty.
PS::: Funny coincidence, earlier this week, my lower left disc was a bit sore, after a couple of days it transferred to my lower right.
The, it was back to my left side and last night I didn't think I'd be able to get out of the shower, the pain was so severe.
I don't do drugs, so this morning, I jerked my "Inversion Sky Hook" out of the shed and spent a few minutes on it, stretching by bones out.
Good as gold and ready for work again. !gotcha!