> And up untill the 1940's spiral fractures in various sports were unknown

The sports were massively less competitive back then, incomparable to todays variant. The sports as a super competitive and popular past time is recent development. If less people do sport and sport itself is less competitive, less people will get injured.

Also, while people were strong, they were not buffed. The robust build, six pack and big muscles is our ideal. Men were basically thin.

> my joke is that the city kids are soft and grey, but the farm kids look good enough to eat, 2 seconds and you see the healthy glow

Fun fact: cities are overall thinner then rural parts.