American English
/ˈfɪt̚.nəs/
2 syllables · Stress the first syllable.
The condition of being healthy and strong enough to do physical activity.
Practice out loudThe condition of being healthy and strong enough to do physical activity.
Walking every day has improved my fitness.
Her fitness is good enough for the race.
physical fitness · improve your fitness · fitness level · fitness training
improve [someone's] fitness
[someone's] fitness is improving
Exercise and other activities that help you stay healthy and physically strong.
The hotel offers free fitness classes.
She reads magazines about fitness and nutrition.
In American English, fitness often refers to exercise as an activity, especially in names such as fitness center and fitness class.
fitness class · fitness center · fitness program · group fitness
a fitness class
a fitness program
The quality of being suitable for a particular use or purpose.
The test measures the fitness of the design for outdoor use.
We questioned the fitness of the plan for a large company.
This formal meaning is most often used in the phrase “fitness for purpose.”
fitness for purpose · fitness for use
the fitness of [something] for [a purpose]
[something]'s fitness for [a purpose]
suitable for the use it was designed for
The product must be tested for fitness for purpose.
a small device or app that records exercise and health information
My fitness tracker counts my steps.
When it means physical condition, fitness is usually used without a plural ending. Say “My fitness is improving,” not “My fitnesses are improving.”