Thinning of the Spine

Hey guys/gals.
Been looking for some reading material about causes/symptoms and some exercises for people who suffer from thinning of the spine , specifically the L4-L5 vertebras.

Other then ads for laser treatments and what not I didn’t find much on google and neither in the forums on this site , so if anyone with any experience can lend a hand I will be very grateful

Don’t really know , all she said was “thinning of the spine”.
Her doctor didn’t even give her a health clearance to train at the gym and I told the gym owner he is making a mistake by signing her but he dosent listen too much.
As far as I know her doctor dosnt even allow her to use the treadmill.
I know I ain’t giving too much information but thats all the info i got.