What Motivates You to Move Despite Pain

I have been treated for PsA since 2018. I have minimal psoriasis, but severe enthesitis in my feet and hips (some of the foot pain may be joint as well since it affects my whole foot). I feel like I've tried everything available accept infusions with little to no success, except Prednisone (helps a lot until it doesn't) and Rinvoq (helped for a short period of time). Currently, I am having trouble walking for any distance. A lot of that is due to pain, but some to a general feeling of weakness and fatigue. When I don't move, I don't feel pain which has led to me moving as little as I can get away with. I feel this is causing my muscles to weaken, kind of losing it due to not using it. I want to start exercising more, but have a really hard time getting in the frame of mind to do it because I know it will hurt.. So does anyone have advice on how you motivate yourself to move even when you're in pain? I've given up on being pain free, but I do not want to give up my mobility.