Let's recreate that thread, I have ideas. I would offer body building training for the kings soldiers because isolation exercises were not invented yet, for example. It may not be very useful but they would look impressive. I would sterilize surgical implements with boiling them, implement basic medical hygiene, challenge the miasma model, lots of stuff could be done.
I wonder how hard it would be to get enough food to support bodybuilding in earlier eras. It would definitely be easier for a small group of guards than for a whole army.
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