Meanings
fit (in good overall physical shape)
predicativeable, prepared, up to a task (able to perform adequately, in contrast to a prior or possibly future state of inadequacy)
Ich war die letzte Woche krank, aber inzwischen bin ich wieder fit.I was sick last week, but I'm fully recovered now.
Examples
GermanEnglish
Er ist nicht mehr so fit wie früher.He is not so healthy as he used to be.
Er wird nicht rechtzeitig fit werden.He won't be fit in time.