when, on what, and how do you sit down?

I have a CCF pad that I cut down to use as a seat (on rock, log or ground) but I also have an Alite Monarch chair (the two legged variety) that is 21 ounces. I carry it sometimes, especially if we will be spending any real amount of time in camp. I also have a 10oz Grand Trunk folding stool that is pretty nice, but doesn't have a back rest. It is a nice night stand next to my hammock!

Depending on the weight of my pack and what we are doing I'll choose one of the three, but I always have something.

I do a little of all of the above. I have a blue foam pad that I use as a framesheet in my pack and as an insulator for freezer bag cooking. I also use it for sitting at camp if the ground is cold.

I take a couple of lightweight trash bags every trip. At camp, I line a couple of those up and sit/lie on them. (At bedtime, my pack goes inside one of the bags right outside my tent). If the ground is dry and reasonably free of stuff that will stick to me, I sit/lie right on the ground. If there are rock seats or logs at camp, I'll use those some.

I never sit on bags etc during breaks from walking unless the ground is wet. When walking, I time my breaks around finding a good place to lie down---always directly on the ground. Sometimes I lie down and get too comfy. I suddenly remember I'm supposed to be walking and was only gonna stop for a couple of minutes. Then I look at my watch and 20 minutes have passed.

I generally don't sit down on the trail.  On the trail, I prefer to rest standing up.  I sometimes lean against a tree while resting.

In camp I sit down.  Most often I sit on whatever is available.  But I recently acquired a very light weight three legged folding stool to sit on.  I found it to be worth every dollar I paid for it, and every ounce it weighs on the trail.

Like TDale I stand to work at my desk.

On the trail I seldom sit down for rests or breaks, would rather stand up (or lean against something) as it seems such an effort to quit being comfortable. I fell asleep, once, standing up, while I was resting on two trek poles. Horses and cows can do it

At camp I ruthlessly protect my Bearikade (the big one). I don't sit well on the ground. I need a rock/tree. At camp, I also stand up to eat. I guess to always be first in line for 2nds?

Winter I carry closed foam with a handle... to kneel on too. (Bony knees) I hate a wet, cold butt sitting on snow/ice.

I used to hike with a gal (Snow Nymph) who was small enough to fit on a child's chair. Any break, the pack was off, the chair was off, set up and her in it before you could take a deep breath. I was impressed by how rested she was by night fall.

Ashepabst, I camped at a camp along the Elk River trail in Kansas last month that looked so much like that pic that I think it might be the same place. Where was that pic taken?