As I sit and glass, which is common for hunters out west, I have sort of quickly discovered something I never learned when I was younger.
In my youth I had enthusiasm and spirit. In my middle to advancing years I have creaky knees, arthritis, and I tire more easily than I used to. Where I used to sit on the cold hard ground I now look for that soft spot to sooth my tired muscles. That leads me to my tip.
Carry your soft spot with you!
In my pack I carry an air filled, ultralight, camping pad. Not only do I carry the self inflating pad but I also carry a chair that the mattress folds and fits in to. That eases the pressure on my back when I'm sitting and glassing. It resembles a camp chair or stadium chair that lots of campers use instead of sitting directly on the ground. I have found that this little addition of weight to my load allows me to sit and glass longer and keeps me from tiring as fast. That allows me to hunt longer and harder which just might make the difference between putting game in the freezer or eating tag soup.
As I talk with plenty of other hunters I am amazed at the number of hunters that have never tried this soft spot tactic or even try to sit on a piece of old rug. The chair feature allows one to relieve pressure on their back. That reduces fatigue, which in turn reduces aches and pains. When the idea struck me it was like an epiphany and I'm only sorry that I hadn't thought of it before.
I was lucky in that I had the pad and chair from my backpacking days. The first time I tried it I found that I could glass a lot longer with a lot less exertion. Hence, I'm sold on the idea. If you have to glass for long periods of time you might want to look into this. I've found that it sure makes things easier.