Oh! I just read an article that mentioned you don’t need to do chin-ups the usual way. Instead, hang as if to do chin-ups, then slowly lower yourself. I think the pros call it resistance training. And do as many repetitions as you like. Don’t overwork yourself either. And give yourself at least a month to see how your muscle tone improves. That’s how I started, too. After doing that for a while, I recovered (not completely) the strength of my younger days to do standard chin-ups. And I use a metal pole for hanging laundry in my yard. No gym and no gym membership req!