Unfortunately, you possible just need to walk more then and focus on your core muscles. I have the exact same thing and the only way to stop my back from aching

Unfortunately, you possible just need to walk more then and focus on your core muscles. I have the exact same thing and the only way to stop my back from aching is to focus on tightening my abs. Doing some basic ab and core exercises like planks, superman, etc will probably help. You need to do them correctly though and rally focus on tightening the right muscles, otherwise it'll hurt the back even more. If you have the means, I'd probably recommend visiting a physical therapist, or a personal trainer who specializes in core strengthening.