In my own experience, the three best things for reducing lower back pain were losing weight, squats, and crunches. The weight (~300 lbs to ~240 lbs) of course was the biggest thing to get me from "rarely I can't even stand up from bed easily" to "rarely do I ever get lower back pain".
Now I get low pain all the time, but it's more of the "sore muscle" variety. It does make me walk a bit oddly, at least until I walk it off, but I wish I didn't get that either.
The difference between the two was that i gained weight but started Pilates. I'm losing weight now but I'll start doing squats and crunches as well, thank you.
You can give them a try, but definitely stop if you don’t see improvement or if it seems to be getting worse.
Though for me a lot of the lower back pain came from really tight hamstrings so the stretching was important for that (and you can't really do squats and deadlifts with proper form without enough flexibility)
They are rumored to be really good for you, though.
They can be done any time, indoors or out. It's much more minimalist than a squat rack so I think its a lot easier for most people to start (unless you're already going to a gym frequently or have your own bar).
If you can do ~100 daily with ease, consider a bigger weight.
Example of good form: https://www.youtube.com/watch?v=YSxHifyI6s8&t=1s
Random link about them:
https://www.womenshealthmag.com/uk/fitness/strength-training...
McGill works with famous weightlifters and athletes which gives him some bro-science cred, he has actual science-science cred but he's also very good on what's actually important for the average aging person.
Highly recommend his back mechanic book.