Strong in the Lungs
Joachim Ziemssen wasn’t exactly strong in the lungs, of course, but that was precisely the reason why a profession in the open air, one that could hardly be said to involve serious brainwork or stress, was probably just the thing for him—as Hans Castorp had remarked rather patronizingly. For he had the greatest respect for work, although, for his part, he found that he did tire easily.
what does it mean "he wasn't strong in the lungs"?
can I say "He wasn't strong in the heart/legs/bones/etc"?