I heat my house with wood. I cut, hand-split and stack 6+ cords of wood every year.
This sounds weird but if my back goes out, there are two things I can count on to make it better. One is about three hours of wood splitting. The other is push mowing. I can’t explain it and it hurts like the dickens when I start but the pain just makes me mad and by the time I am done, I feel better.
My theory is the only thing that can make your back feel normal is to kick it’s but and make it happy that you’re not making it mow or split wood.
As your muscles begin to atrophy, your ligaments, bones and tendons start to take over the work. As your muscles strengthen, they take the load off your bones.