I want to want it…

My doctor told me I need to exercise to lower LDL and for Bone Density. It’s been a year and I still haven’t. I will start and then stop. One would think that being healthy is a compelling enough reason to exercise but my brain isn’t there. I see certain people that thrive with exercise and I want to feel that. I try and do thought work and all I can come up with all kinds of models proving my results of not exercising. I tried starting the Model backwards and asked myself what would I have to think/believe but then when I got to the thought I stalled! Every thought I put in didn’t sound right. What are your thoughts?
C-poor ldl and bone density OR Doc said to exercise?
F- ready
A- make plan when/how
R- Exercise