If you watch those "restored 1920s street scene" videos on YouTube then you'll quickly notice that every single pedestrian has outstanding posture.

And up untill the 1940's spiral fractures in various sports were unknown,The base level of exercise from normal activities starting in early childhood built a more robust skeleton and stronger muscle attachment points. Proof would be trivial, as amish and menonite comunities still follow the same practices.....they are not known as slouchers go look at average city kids, and then go look at the ones bieng raised on biodynamic farms, 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