I'm 50 and I've always struggled with bad posture, although I've never really had any negative symptoms other than looking bad. But I know that posture and core strength are supposed to be important as you age, and so I'm trying to improve this.
So I'm paying attention to standing up straight and got a decent office chair and things like that. Now I find that my lower back aches, but I'm not sure if this is because I'm doing something wrong (which I need to change), or because I'm suddenly requiring my back muscles to do work they've never done before (which I need to tolerate until I get stronger).
How can I tell the difference?