In a post a month or two ago, Mike Sigman made a really sensible postulation about the African water carriers and such load bearers, noting that a jin path to the ground was the most likely reason for their amazing abilities. It's not magic, and it's not even "rocket science."
Yet saying 'jin path' is not science. It is simply using a placeholder for what someone wants us to believe is science.
As far as non-Africans not being able to match their feats. That makes good sense, considering those particular Africans have done that their whole life, probably from a very young age, and they do it for a living. You know, gongfu, skill over time?