I really don't think that this is new news. When I went through about four years ago, the emphasis was definitely on core and bodyweight exercises, with more rucking than long runs and lots of shuttle runs, wind sprints, 60/120s, etc.
"Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave whither Thou goest." - Ecclesiastes 9:10
"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so." - JRRT