Weight training

Post diagnosis I've been told that I need to build muscle so my body can make up for the messed up joints in my body, but my rheumatologist told me to avoid any and all strenuous movement to reduce risk of dislocations and subluxations, which seems kinda counter intuitive to me??

I've been wondering how to safely workout while keeping my joints in place, as even when I'm carrying a 1kg package in my hand my shoulder and wrist subluxate. My patella subluxates at the slightest touch, and so do my hips now. Any advice?