fit·ness ˈfitnəs/ noun the condition of being physically fit and healthy. "disease and lack of fitness are closely related" synonyms:	good health, strength, robustness, vigor, athleticism, toughness, physical fitness, muscularity; More the quality of being suitable to fulfill a particular role or task. "he had a year in which to establish his fitness for the office" synonyms:	suitability, capability, competence, ability, aptitude; More In this sense, her fitness involves overeating and complaining online, so yeah, she is fit.