Trying to find info on exercise for the purpose of strength, not changing physique

A lot of stuff I've found is about bodybuilding or losing fat, neither of which I'm interested in. I want to be stronger, I want the physical and mental health benefits and I want to improve my posture. I've been able to find some exercises that are about reaching these goals, but haven't found anything for back exercises. What terminology could I use to find what I'm looking for? What are some good sources, exercises and the like? Thank you