In centuries gone past, members of the bourgeoisie would be directed by their doctors to summer homes and country estates so they could "convalesce in the count

In centuries gone past, members of the bourgeoisie would be directed by their doctors to summer homes and country estates so they could "convalesce in the countryside". It seems there was something to it, or at least there is now. (Even back then, it was explicitly about "fresh air".)