Re: Back issues - It's been over 20 years ago that I was diagnosed with a fully ruptured disk (S1 - L5). I asked the surgeon at that time what happens now, and if my body could repair the damage. He said, "No way. It's just a matter of time before you're on the table." My blowout was rare because it went straight out the back, so I never really got the classic sciatica symptoms.
I got to a point of being mostly functional 8 weeks after the disk blew, but was in constant (but not debilitating) pain. I was doing martial arts (Jui Jitsu in particular) to have some sort of workout to keep my core toned. The owner of the dojo I was at embarked on this Ultimate Black Belt test that required him to do 1000 sit-ups/push-ups a week for a year, and I also started doing that workout with him.
After about 3 - 4 months of doing this I noticed that I was no longer in pain. It's funny that when you're in constant pain and it slowly goes away, you don't really notice right away when it's gone.
Looking at Mrs 888, it looks like she is in otherwise good shape so this probably doesn't apply to her, but through experience I've found maintaining core strength is huge in reducing back pain and minimizing future downtime when I do tweak things. I still get back issues, but they maybe last a day or two rather than weeks.
I'd love to have another MRI to see what the heck my body did to adjust and recover, but that answer just isn't worth a couple grand to me because it'd be all out of pocket to have one done for that reason.
In the 20 years since this happened, there are more options now, including disk replacement. Being mechanically inclined, the spinal fusion/s never really made sense to me.