Amen to all of that!!! I've got some nigh on crippling pain in my spine but if I don't keep moving, I'll stop moving altogether and getting in firewood is an important part of our exercise plans here every year, among the thousands of other things we do.
Mom, blessedly, doesn't have any pains at all in her body~a sheer miracle for a woman who has had 9 kids, has homesteaded for half her life, and whose sisters and brothers are all either dead and gone or crippled up so bad that they can barely walk, with steel rods up their spines and fake knees and hips. Between us both, we can get a powerful lot of work done here...it may not get done as fast as when we were younger but it does get done.
And that's how one stays active into old age...can't seem to convince folks of that, but it's the simple truth. A body in motion, stays in motion.
Besides...wood heat is the perfect tonic for old, achy bones and joints!