“I’ll just note that virtually everything we do to our bodies to improve them injures them a bit in the short term…”
Yes, but there are degrees, no? A long day on the slopes, or at the gym; or a hard six day hike isn’t comparable to attempting a FKT of the JMT or a six month hike of the PCT, etc.
Of course. But as I averred above, we don’t know from the subject “study” whether the damage to the hiker happened progressively over the months or over a few push days at the end, nor do we know if he recovered to a state worse, equal, or better than he started.
There have been studies…
But we’re not discussing those studies. :-)
Don’t get me wrong, I suspect most of what’s being theorized in this thread is probably correct. But the subject “study” doesn’t tell us much–if anything–about all that.

