Meaning of 'in the pink'

[Unknown]

Test No. express/elem-5 "In Control", question 5

Thanks to her regular workouts and sensible diet she certainly strikes me as in the pink.

(a) in extreme health
(b) in good health
(c) in absolute health
(d) in clear health

Test No. express/elem-5 "In Control", answer 5

Thanks to her regular workouts and sensible diet she certainly strikes me as in good health.

Correct answer: (b) in good health
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I don't know the meaning of in the pink. Can you explain it for me?

[Alan]

Hi,

This expression (in the pink) means that you are feeling good/healthy/fit.
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English as a Second Language
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