What can I do to ease knee and shoulder pain during weight training?

[Mila3]

So I’ve been pretty consistent with my weight training for about a year now, but lately my joints—especially my knees and shoulders—just feel constantly achy and creaky. I don’t think it’s an injury, just this persistent wear and tear that’s making every session a grind. I’m wondering if I need to start incorporating some mobility work into my routine, or if this is just a normal part of pushing yourself. Has anyone else hit this kind of wall?