As I mentioned recently, if you quote a pasuk directly, an Yid will admit to it, whatever his level of stubbornness or ignorance is! Mi kamocha …
A historical tidbit: doctors recommended to Netziv to go on vacation to the lakes. He ran away from there back to Volozhin, he could not stand idleness …
On the other hand, R Grozdensky and others were “summering” away from Vilno towards Grodno (Druskene), but probably formed a community there so were not totally idle.
Also, R Salanter took a trip to the “waters” and even ate pas akum bread there. he explained that he would be ok to eat stale pas yisroel bread instead, but he was gifted money to improve his health and using money to eat bad food instead would be stealing. I did not know his source before, but it seems to be Nedorim 50 where a doctor sees the patient being fed with hard food and refuses to treat him: what is the point of treating a patient if he has an unhealthy diet!? Modern doctors should take this to heart.