be fighting fit

To be in very good health. Primarily heard in Australia. My father has never been sick a day in his life—he's truly fighting fit. Now that I'm going to the gym regularly, I hope to be fighting fit soon. Every member of our squadron must be fighting fit before going into battle.

See also: fight, fit

See also:

(as) right as a trivet
sick in the head
Uncle Dick
take sick
at the point of (doing something)
all oak and iron bound
all oak and iron bound and *sound as a barrel
get sick
get sick of (someone or something)
(as) sick as a pig

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