Thanks for the replies.
"Not all pain is equal ..." Yeah, I guess there are different kinds of pain, and different levels, and different endurance abilities for different types of pain. What would we call, for example, intense lactic acid burn, like what you get when you, say, go to failure at about 12 reps on hack squats, pausing for a full 3 seconds and contracting the quads hard at the top and bottom, then squeezing out 6 or so forced reps of the same sort after that? I did that last week, and by the end of the set I was close to tears, but 30 seconds later I felt like a million bucks. (OK, maybe a few minutes later, lol) That was the most intense set I've ever done in my life - except maybe for a set of squats I did one time that actually DID make me cry. But that was pre-contest, so it's different. Why would that not necessarily count as pain?
It's a different type of pain from the type that slams you flat on your back and you can't move or breathe for days, or the type where you, say, have a nasty blister that the band-aid has melted into and you have to carry on hiking on it for hours and hours, gritting your teeth hard at every step.
But it still hurts.
For me, it doesn't come anywhere near the discomfort of dieting, though. But that's not really "pain", unless you're severely restricting calories.
Is pain just all in the mind? Do some people have a natural propensity to be able to separate and isolate pain from themselves? Or is it just something that comes with practice?