Sitting in a tree stand for some 12 hours involves boredom. It is virtually impossible to concentrate all the time. And in our boredom we miss deer and other animals. Most times the deer wasn't there; then suddenly was there. Many would have been missed. Especially the deer which I spotted, its head and neck only, showing through the V of a tree. I would have never harvested that deer if I wasn't concentrating.
Would have never spotted the quiet coyotes that I spotted moving through the trees. Never would have harvested them.
Missed one coyote, when I thought I was concentrating. The coyote got so close go me, silently in my rear, that it would have been an easy bow shot. I just couldn't get the bow around in time, to get the shot.
I'm glad I learned hunting concentration before cell phones. Lots of concentration time is lost due to time talking on the cell phone, texting on the cell phone, and time just talking on the cell plone.
The cell phone, the very thing that helps people lose their concentration. The deer they see and lose; the deer they never see.
You do your best in concentration and fighting boredom. Sometimes your struggle isn't good enough.