I'm not implying you are old Del, but you do however have a few on me. So with that said, I only hope I have your drive and determination later on. There sure isn't much that stops you and your intentions!
I have considerable body/ joint pain, was re-diagnosed this last spring as "systemic" meaning something such as Lupus, or Lyme disease. I have neither and have been tested for "everything they can think of." So, sometimes it may not be drive so much as the idea that if I sit for long, that gets worse, as well.