fit

The word “fit” means physically healthy and in good shape. In plain terms, being the right size/shape for something, being suitable, or being in good physical condition — with newer slang senses for "attractive" and "outfit.".

“Fit” is pronounced fiht (/fɪt/ in IPA).

Here is “fit” used in a sentence: “She trains every day to stay fit.”

Depending on how it is used, “fit” can be an adjective, a verb and a noun.

The word “fit” comes from Middle English. Origin uncertain; possibly linked to an old Middle English word for a well-matched opponent, later shifting toward the idea of things matching or suiting one another.

“Fit” is a very common word in modern English, usually learned at around the A2 level.

“Fit” has 8 distinct senses listed in this dictionary. The most common is: physically healthy and in good shape.

Fitness is about physical performance — strength, stamina, and how well your body handles exercise. Health is broader, covering the absence of illness and the good working of body and mind. You can be fit yet unwell, or healthy without being especially fit, though the two usually support each other.

Thin describes body size — carrying little fat or weight. Fit describes condition — being strong, active, and physically capable. A thin person is not automatically fit, and a fit person is not always thin, since muscle and stamina matter more to fitness than a number on the scales.

Generally, yes. Fitness improves with regular activity, and almost everyone can build strength and stamina from their own starting point, whatever their age or ability. Progress depends on consistency rather than natural talent. Anyone beginning or changing a routine should build up gradually and seek medical advice if unsure.