The answer is - it's both. There's also parallels in archers in Europe from the longbow period: https://en.wikipedia.org/wiki/English_longbow#Training You can tell who was a professional archer by looking at their skeleton, and so naturally families who had bodies with more readily adaptable skeletons typically became archers. This married the morphology of an archer to social status and family line.

“Make the tall girl join the women’s basketball/volleyball team.”