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"fitness" is also used as a crossword clue. If that's what you saw, the answer is often suitability (11 letters).
Definitions
the quality of being suitable
Word origin
From fit + -ness. First attested in the 16th century, with the physical sense from 1935.
Used in a sentence
“That's chiefly why they're coming; I want you to meet them here and then tell me frankly what you think of their fitness for whatever we decide on doing.”
“Carroll has been edging slowly towards full fitness after his expensive arrival from Newcastle United and his partnership with £23m Luis Suarez showed rich promise as Liverpool controlled affairs from start to finish.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Workout condition”7 letters
02“Physical condition”7 letters
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