Me too, but now I "work smarter" than harder. About 2 months ago, I took out a 12" diameter tree. It was mostly cut down a year before, but
I left 10' of it standing. then I killed the roots. I got out the "demolition hammer" with a "clay spade" and a reciprocating saw and most of the root and the remainder of the tree was out in an afternoon. It's tough when the tree is cut at the ground level, but a lot easier if you leave at least 6 feet. The next day, I had to find a new chain for the chain saw. The following day, I dug out most of the feeders, then it was to backfill the hole and cut up the tree for firewood for someone else.