Oh, I'm aware that our bodies are quite adaptable. I think we may have discussed something similar, possibly in a PM conversation at one point, but for one thing I know that in some kinds of martial arts - from what I know, at the very least certain styles of kung fu - the artist would actually train its bones by hitting hard objects, as the repeated damage to the bones caused them to harden to a much higher degree than bones usually would. Aside from that, I can think of a number of other examples... Like how people who live in sterile environments tend to be more susceptible to illnesses, or that humans were much more self-cleaning or dirt-defiant, however you want to put it, before they started bathing regularly. (Random fact: One reason a lot of other cultures thought the Vikings an odd bunch in their heyday was that while the parts of the world they usually interacted with thought little of hygiene, the Vikings were actually quite keen on cleanliness. Even back then the Vikings were known to habitually bathe once a week, and to wash their hands and faces every day. They would also wash, comb and braid their hair and beards. Another random fact: although the Viking culture was mostly patriarchal, women were actually held in very high regard and respected just as much as men, and usually enjoyed considerably greater freedom than in the rest of Europe. Though there were cases of female Viking warriors (shieldmaidens), they were also in charge of the finances of their family, and could actually end up rather rich and powerful in that regard, and were very strictly protected from unwanted attention from men; just kissing a woman who did not agree to such a thing was punishable by law. Not only that, but while infidelity was unacceptable for Viking men, if a woman partook in it and ended up pregnant, her husband was expected to unconditionally accept the child as his own, whereas the actual father had no right to it. Eh... that was a lot of random.)
Anyway, yeah, organisms are adaptable.