Nope, just a human in good shape. 65 years old, 6', 192, 12% body fat. I work out 5 mornings a week, weights and cardio. No gut. I'm also a blacksmith. Afternoons, I do 3 miles in my hunting boots with a 25-30 pound pack, carrying either dumbbells or my rifle...in my hands. You should give it a try - it opens up a lot of possibilities...like carrying a rifle in your hands or being able to tie your shoes, without having to stop to catch your breath.
Is it reasonable to consider one's size when teaching about rifle weight? You are in good shape at 192 pounds and 65 years old. I am in pretty good shape at 155 pounds and 73 years old. Does it seem reasonable that I would be expending more effort with a nine pound rifle than you would with a nine pound rifle? mathman can tell you our work accomplishment would be the same. But work and effort are not the same.
This year I hiked over hill and dale and was very comfortable with an eight pound .270 Win. Nine pounds would go past pleasure.
