It'll blow their minds when they start researching chi kung and realise it's possible to draw in more energy by breathing and move it round the body. It's also possible to feel some kind of field around the body.
Auras and chakras don't sound so silly now do they.
"It'll blow those Chemists' minds when they start researching Alchemy and they realize the incredible power of mercury and lead to rejuvenate the body and lead to an elixir of youth!"
"It'll blow those Astronomers' minds when they start researching Astrology and the powerful effect of being born under auspicious constellations!"
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If the ancient guru knowledge is so great, what testable predictions does it offer, where "auras" are a causal mechanism?
In other words, not: "Thou must intake the golden aura of oats and fiber by eating some, to counter the dark brown blockage of your Pu-point." The folk remedy might well solve your constipation, but it wouldn't be evidence for the mythology around it.
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> possible to draw in more energy by breathing and move it round the body
We already know what haemoglobin is thanks