Meaning & use

fitness

noun·Everyday

Last updated

UK/ˈfɪtnəs/
US/ˈfɪtnəs/

Meanings

  1. noununcountable

    The state of having a healthy, strong body that can do physical activity well, usually built up through exercise.

    Grammar: Uncountable: improve your fitness, not a fitness.

    Patterns

    • fitness level
    • improve your fitness

    Regular swimming has greatly improved her fitness.

    The recruits must pass a test of physical fitness before training.

    He lost his fitness during the winter break and had to start slowly.

  2. noununcountableformal

    The quality of being suitable or good enough for a particular purpose or role.

    Grammar: Usually followed by for or to: fitness for the job, fitness to practice.

    Patterns

    • fitness for something
    • fitness to do something

    The committee questioned his fitness for public office.

    Inspectors check a ship's fitness to sail before every voyage.

    The court examined the doctor's fitness to practice.

  3. noununcountablebiologytechnical

    In biology, how well an organism's inherited traits help it survive and produce offspring in its environment.

    Grammar: A technical biology sense: evolutionary fitness, not exercise.

    Patterns

    • the fitness of an organism

    Longer legs gave the deer greater fitness in open grassland.

    Biologists measure fitness by the number of surviving offspring.

    A trait that lowers fitness tends to disappear over generations.

Common combinations

physical fitness
Physical fitness depends on exercise, sleep and a balanced diet.
improve fitness
Brisk walking is an easy way to improve fitness.
fitness level
Choose a class that matches your fitness level.
cardiovascular fitness
Cycling builds cardiovascular fitness quickly.
fitness for purpose
The tests prove the product's fitness for purpose.
fitness tracker
My fitness tracker counts my steps and heart rate.

Synonyms and how they differ

health
Health is the wider state of being free from illness, whereas fitness focuses on strength, stamina and the body's ability to perform.
conditioning
Conditioning is the training process that builds fitness, so it names the effort rather than the result.
suitability
Suitability replaces fitness in the second sense but is more general and less formal.
stamina
Stamina is just the ability to keep going for a long time, a single part of overall fitness.

Opposites

unfitnessfrailty

Word family

fit adjective
healthy and strong, or suitable
fit verb
to be the right size or shape
fitter adjective
more physically fit than before
unfit adjective
not healthy enough or not suitable
fitly adverb
in a suitable way (formal, rare)

Commonly confused: fitness or fitment? fitness or wellness?

fitness vs fitment

A fitment is a fixed piece of equipment in a building, such as a light, not a state of health.

fitness vs wellness

Wellness covers overall physical and mental well-being, a broader idea than athletic fitness.

Practice

In evolutionary biology, an animal with high fitness is one that

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