I found the link to this paper on Reddit/Running cgj.sagepub.com/content/ear...
Basically a history of how the act of "jogging" came about in the US in the 1960's. I can remember the 60's - although I have read that IF you can remember the 60's , then you weren't there!
But I do remember people "jogging" in the 60's - and I couldn't do it! But I can now!!
Reading through this, it feels much like C25K to me -- BUT it was never ever meant to go on to non-stop running of 5Ks, 10K's, marathons, etc. Jogging was essentially run/walk - for periods up to 30 minutes -- EVERY day!! to combat the already prevalent modern day obesity, and to live longer!