This is how I use foot pounds so energy- one pound lifted one foot.
If I climb a 3000 foot ridge with 4 extra pounds of fat or gear I have expended 12,000 foot pounds of needless wasted energy that day. On a 7 day hunt it is 7x that.
This expenditure is onerous in my books. Yeah , I watch my figure and carry lightweight gear . Hunting can be an endurance event.