1
general::
In good health, as in We're glad to hear Bob's in the pink again. In the 1500s pink meant "the embodiment of perfection," but the current idiom dates only from about 1900.
American Heritage Idioms
2
general::
Phrase(s): in the pink (of health)
Go to *in the pink (of condition) and *in the pink (of health), Phrase(s): *in the pink (of condition) [and] *in the pink (of health)
Fig. in very good health; in very good condition, physically and emotionally. (*Typically: be ~; get [into] ~.) • He recovered completely from his surgery and has been in the pink ever since. • She was lively and active and in the pink of condition.
McGrawhill's American Idioms And Phrasal Verbs