I try to walk a couple of miles at least 3 days a week
Even when I was a "40 something" mountain climber, I never did go for "distance" on my exercise hikes; I always went for "time" - still do. Not that I completely ignore how far I hike, it's just that I hike only long enough to get my heart rate up, and keep it there for about 20 minutes a day.
Thirty years ago, I could hike down to Marsh Creek (which happens to be 2 miles away) and back to the house in an hour. And when I was training for a climb, I would strap on a backpack and keep adding milk jugs full of water until it was heavy enough to get my heart rate up for the last 20 minutes of that 1 hour hike. The fact that the hike was 4 miles long was just coincidental.
Nowadays, at age 73, and with the lower 3rds of each of my lungs scarred from a bout with a bacterial pneumonia back in 2005, my heart rate is up in less than 5 minutes into my hike. So I only hike hard for about 15 minutes in one direction, then I turn around and come home. I have no idea how much distance I cover - I know I'm nowhere near half-way down to Marsh Creek before I have to turn around.
Nevertheless, to get back to the subject - my favorite way of mule deer hunting is to climb to a saddle before day break, sit down, and wait for sunup. Hopefully, a deer will either wander through the saddle, or be pushed through by other hunters (unknowingly) as the other hunters are getting out of their rigs back down on the road and moving around. If I don't "score" that morning, likely as not I'll be sitting on the side of the same saddle at dusk - after going back to camp, getting some lunch, and resting up for a few hours before making the same climb to the saddle again.
The real "work" involved in the way I hunt, and what I try to stay in shape for, is the drag out. I'm sure some of the deer drags I did in my younger years would kill me nowadays.