A "fitness test" is a way to check how physically fit someone is. It is like a test or assessment to see how strong, fast, or flexible a person is. Full definition
However the manager was cautious about their chances to play against the Black Cats, and it is likely that they will face a late fitness test before being committed. (arsenalnewshq.com)
It is part of many fitness tests for special response teams. (onnit.com)
That's why we think it's so important for couples to conduct their own marriage fitness test from time to time. (marriage.com)