If you want to shoot a largecaliber rifle as accurately as possible then I think you want to focuselsewhere.
Correct
The loaded or not demonstration isn't really an issue of saying "don't flinch, don't flinch, don't flinch". It is saying, focus on the trigger pull and clear your mind. Don't worry about the recoil.
Correct.
If you are just looking to build your body up to be able to withstand heavy recoil then work out in the gym and shoota bunch of the cheapest magnum ammo you can find. Have someone punch you in theshoulder a bunch of times in a row.
IMO, physical strength or conditioning to "take a beating" are not required. Being tough and durable certainly don't hurt but is not a requisite. On the other hand a failingbody DOES pose a problem.
Theprimary factor and the one left largely unaddressed isthe psychological aspect, including the "battle within."