Take er easy on that back! That's some nice stackage ya got thar! Let the back rest and work on 18-19 this winter!
Which part of the stack is that polar wood in? Yes, take it easy on that back. You don't want to get worse!
Rest up and heal that back, those kind of problems can stay with you for life. The wood will still be there.
I'm pacing myself. I used to just be a wild man cutting. I wish I could use ibuprofen but it ain't quite cutting it right now