I have the feeling I’ve always had a weak back.
Some 4 months ago I started working out regularly. Now I can almost touch the floor with my hands without bending my knees.
While doing this exercise I heard a small crack on my back, nothing serious.
Since then I can lift weights easier than before but my back still hurts a bit. My back doesn’t hurt as much after coming home from work, which was normal before.
What else could I do to have a stronger back?
Using a real wooden Chair. For 20 Years now, I use a normal wooden chair for my PC Work instead of a office chair. If I want to turn around, I (my back) does it, not my chair. If I want to get closer, I do it, not my chair. Up? Down? Change sitting position. I have no scientific proof, but I feel like moving my own body, finding positions to sit and moving around on it did better to my back than sitting motionless in a padded office chair swiffeling around while my back degraded further and further. At least my office-chair-colleague around me constantly talk about back problems and then go and buy an even more expensive office chair where they even have to move less. But you want to move more, not less for your back to not deteriorate
Buy a chair where you yourself move with your back, not a chair that prevents your body from moving. Also, switch between standing and sitting multiple times a day if you can. Keep Moving. Keep those joints and muscles in motions.