For me weightlifting is about staying in shape for things like mountain adventures, feeling great, looking good. But Arnold-look is a silly goal for long term wellness, and so are the methods to get there. Once I stopped pushing the numbers and focused on more repetitions, I never had any injury. That's worth much more than some momentary number of kilos/pounds you did today - nobody will care about that tomorrow, but injuries remain, sometimes forever.
https://www.barbellmedicine.com/blog/pain-in-training-what-d...
https://www.barbellmedicine.com/blog/movement-variability-sh...
These are the two stretches that help me the most.
Highly recommend going through bob and Brad, and Dr Jo on YouTube. I try stuff all the time and have regained much of my mobility.
- Prone Press Up (https://www.youtube.com/watch?v=Sws_GwrlYO0): Relieves tension in lower back, pressing discs back towards their natural position.
- Banded Hamstring Stretches (https://www.youtube.com/watch?v=msxQR56U7sI): You can use a belt for this if you don't have the bands, but properly and consistently stretching my hamstrings was the biggest thing I did to relieve (and 'cure') my back pain after the herniation.
https://www.youtube.com/watch?v=4BOTvaRaDjI
He runs through them pretty fast, but someone in the comments recommended playing it at 0.75x speed and that works great.