A clean bill of health is an expression used to indicate that someone is free from any serious health condition or illness. Synonyms for this expression include "in good health," "fit as a fiddle," "healthy as a horse," and "well and hearty." These phrases all convey the same meaning, but with slight differences in tone and connotation. "Fit as a fiddle" and "healthy as a horse" are more colloquial expressions, while "in good health" is a more formal and neutral term. Regardless of the chosen phrase, all imply that the individual is in excellent physical condition and has been cleared of any health concerns.