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A1 noun #2,812 most common 15 min read

fitness

At the A1 level, 'fitness' is a simple word that describes being healthy and strong because you exercise. You might use it when talking about your hobbies or your weekly routine. For example, 'I go to the gym for my fitness.' At this level, you don't need to know the complex biological or legal meanings. You just need to know that fitness comes from activities like running, swimming, or playing sports. It is a noun, so you use it after words like 'my,' 'your,' or 'for.' It is important to remember that 'fitness' is the name of the thing, and 'fit' is the word you use to describe yourself. So, you say 'I am fit' and 'I like fitness.' Most A1 learners will see this word in signs for 'Fitness Centers' or in basic health brochures. It is a very positive word that is linked to feeling good and having energy to play.
For A2 learners, 'fitness' starts to appear in more varied sentences. You might talk about 'improving' your fitness or 'working on' your fitness. You will also see it used with other words to make new phrases, like 'fitness instructor' or 'fitness class.' At this level, you should understand that fitness is not just about being strong, but also about not getting tired quickly. You might use it to describe why you are doing a certain activity: 'I am taking a dance class to improve my fitness.' You should also be aware that 'fitness' is usually uncountable, so you don't say 'many fitnesses.' Instead, you talk about 'a lot of fitness' or 'better fitness.' You might also start to see the word in the context of 'fitness trackers' or apps on your phone that count your steps.
At the B1 level, you can use 'fitness' to discuss more abstract ideas about health and lifestyle. You might talk about the 'importance of fitness' in modern life or how 'physical fitness' affects your mental health. You should be comfortable using common collocations like 'attain fitness,' 'maintain fitness,' and 'peak fitness.' You might also encounter the word in professional contexts, such as a 'fitness test' for a job like a police officer or a firefighter. At this level, you should be able to explain the difference between being 'healthy' and being 'fit.' You might say, 'He is healthy because he eats well, but his fitness is low because he never exercises.' You are also likely to see 'fitness' in news articles about public health or sports reports.
B2 learners should understand the more formal uses of 'fitness,' particularly the meaning of 'suitability.' For example, you might read about a person's 'fitness for trial' or 'fitness for office.' This has nothing to do with exercise and everything to do with being the right person for a specific situation. You should also be able to use the word in more complex grammatical structures, such as 'The level of fitness required for this task is very high.' You will encounter 'fitness' in more technical discussions about sports science, such as 'cardiovascular fitness' or 'muscular endurance.' You should also be aware of the evolutionary meaning ('survival of the fittest') and be able to explain that it means 'best adapted,' not necessarily 'strongest.' Your vocabulary should now include synonyms like 'stamina,' 'vigor,' and 'conditioning.'
At the C1 level, you should have a nuanced understanding of 'fitness' across all its domains—physical, professional, and biological. You can use the word with precision in academic essays or professional reports. You might discuss 'the socio-economic factors that influence public fitness levels' or 'the legal implications of a fitness-for-purpose clause in a contract.' You should be able to use the word metaphorically, such as 'the fitness of a theory' (how well it fits the facts). You should also be familiar with idiomatic or specialized uses, such as 'match fitness' in sports or 'reproductive fitness' in genetics. Your use of the word should be natural and varied, reflecting an understanding of its different registers. You can also critique the 'fitness industry' and discuss complex topics like the 'medicalization of fitness.'
For C2 learners, 'fitness' is a tool for precise and sophisticated communication. You understand the deepest etymological roots of the word and how its meaning has shifted over centuries from 'suitability' to 'physical health.' You can use it in highly specialized contexts, such as discussing 'Darwinian fitness landscapes' in evolutionary biology or 'fitness functions' in computer science and genetic algorithms. You are aware of the subtle connotations the word carries in different cultures and how it intersects with ideas of beauty, productivity, and morality. You can use 'fitness' in complex rhetorical ways, perhaps in a legal argument about 'parental fitness' or a philosophical discussion about the 'fitness of the soul.' Your mastery is such that you can use the word in any context—from a casual gym chat to a supreme court brief—with perfect accuracy and tone.
Practice it Examples Notes & Tips

fitness in 30 Seconds

  • Fitness is the state of being physically healthy and strong, usually achieved through regular exercise and a balanced diet.
  • It encompasses various components such as heart health, muscle strength, and flexibility, allowing for better daily performance.
  • Beyond physical health, the term can also refer to the suitability of a person or object for a specific role or task.
  • In scientific contexts, it specifically describes an organism's ability to survive and pass on its genes to the next generation.

Fitness is a multi-dimensional concept that primarily describes the state of being physically healthy, strong, and capable of performing physical tasks without undue fatigue. At its core, fitness represents the synergy between various bodily systems—cardiovascular, muscular, and metabolic—working in harmony to sustain activity and promote longevity. When we speak of fitness in a general sense, we are often referring to a person's ability to meet the physical demands of their environment, whether that involves climbing a flight of stairs, running a marathon, or simply maintaining a healthy posture throughout a long workday. It is not merely the absence of disease, but a positive state of physical well-being that allows for a high quality of life and the energy to pursue personal goals and hobbies.

Physical Fitness
The capacity of the heart, lungs, and muscles to function at optimal efficiency.
Cardiovascular Endurance
The ability of the heart and lungs to supply oxygen to the body during sustained physical activity.
Muscular Strength
The maximum amount of force a muscle can exert against a resistance.

The concept of fitness has evolved significantly over the decades. In the mid-20th century, fitness was often associated with military readiness or athletic prowess. Today, the definition has broadened to include 'wellness,' encompassing mental and emotional health as integral components of a 'fit' lifestyle. This holistic view suggests that a person with high fitness levels is better equipped to handle stress, recover from illness, and maintain cognitive function as they age. Fitness is often categorized into five main components: cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition. Each of these areas contributes to the overall 'fitness profile' of an individual, and a balanced approach to training usually addresses all five to ensure comprehensive health benefits.

'The doctor told me that my cardiovascular fitness has improved significantly since I started swimming three times a week.'

In a more technical or biological context, fitness can also refer to 'evolutionary fitness' or 'Darwinian fitness.' This is a measure of an organism's ability to survive and reproduce in a specific environment. While this differs from the gym-related definition, the underlying theme remains the same: suitability and adaptation. Just as a fit athlete is well-adapted to the demands of their sport, a fit organism is well-adapted to the pressures of its ecosystem. Understanding this distinction is crucial for advanced learners, as the word 'fitness' appears frequently in scientific literature with this specific, non-physical-exercise meaning. However, in everyday conversation, 99% of the time, 'fitness' refers to the health and exercise domain.

Furthermore, fitness is often used as a modifier in compound nouns, such as 'fitness center,' 'fitness tracker,' or 'fitness regime.' These terms highlight the industry that has grown around the pursuit of health. The 'fitness industry' encompasses everything from gym memberships and personal training to wearable technology and nutritional supplements. This commercial aspect of fitness emphasizes the proactive nature of the concept; fitness is something you 'work on' or 'maintain' rather than something you simply 'have' or 'don't have.' It is a dynamic state that requires consistent effort and attention to nutrition, sleep, and physical activity.

'Joining a local fitness club helped her stay motivated during the winter months.'

Flexibility
The range of motion available at a joint or group of joints.
Body Composition
The ratio of fat to lean mass (muscle, bone, water) in the body.

Ultimately, fitness is a personal journey. What constitutes 'fitness' for a 70-year-old recovering from surgery is vastly different from the 'fitness' required by a professional athlete. This relativity is what makes the word so versatile. It adapts to the context of the individual's life and goals. Whether it is the ability to play with grandchildren without getting winded or the capacity to break a world record, fitness remains the fundamental metric of human physical capability and resilience.

'His level of fitness was so high that he could hike for eight hours without a break.'

Using the word 'fitness' correctly involves understanding its role as an uncountable noun in most contexts, though it can occasionally be used in specific ways. Primarily, 'fitness' functions as the subject or object of a sentence describing a state of health. You 'improve' your fitness, 'maintain' your fitness, or 'test' your fitness. It is frequently paired with adjectives that specify the type of health being discussed, such as 'physical fitness,' 'mental fitness,' or 'aerobic fitness.' Understanding these collocations is key to sounding natural in English.

Improve fitness
To make your physical condition better through exercise.
Maintain fitness
To keep your current level of health and strength.
Fitness level
A measurement of how fit someone is.

When constructing sentences, 'fitness' often appears in the phrase 'fitness for [something].' This indicates suitability. For example, 'The committee questioned his fitness for office' doesn't mean they think he is too weak to sit in a chair; it means they doubt his moral or professional suitability for the job. This 'suitability' meaning is very common in formal, legal, or professional English. In these cases, 'fitness' is synonymous with 'appropriateness' or 'qualification.' If you are writing a formal report, using 'fitness' in this way shows a high level of vocabulary mastery.

'The judge had to determine the defendant's fitness to stand trial.'

In the world of sports and exercise, 'fitness' is often used as an attributive noun, meaning it acts like an adjective to modify another noun. Common examples include 'fitness instructor,' 'fitness class,' 'fitness equipment,' and 'fitness goals.' In these instances, you don't need to change the word 'fitness' at all; it simply sits before the other noun to describe its purpose. For learners, this is a very 'productive' pattern—you can create many useful phrases just by adding 'fitness' to words related to health and business.

Another important aspect of using 'fitness' is understanding its relationship with the adjective 'fit.' While 'fit' describes the person ('He is fit'), 'fitness' describes the quality ('His fitness is impressive'). A common mistake for A1 and A2 learners is to use the noun when they need the adjective, or vice versa. For example, saying 'I want to be fitness' is incorrect; you should say 'I want to improve my fitness' or 'I want to be fit.' Practicing the transformation between 'fit' and 'fitness' will help solidify your understanding of English word families.

'Regular exercise is essential for maintaining physical fitness as we age.'

Fitness regime/routine
A planned set of exercises followed regularly.
Peak fitness
The highest possible level of physical condition.

Finally, consider the register. In casual conversation, people might just say 'getting in shape' or 'working out.' Using the word 'fitness' sounds slightly more formal or professional. It is the preferred term in medical contexts, sports science, and corporate wellness programs. If you are writing an essay about health or a cover letter for a job in the sports industry, 'fitness' is the most appropriate and precise term to use.

'The company offers a fitness subsidy to encourage employees to stay active.'

The word 'fitness' is ubiquitous in modern society, appearing in a wide variety of environments from the highly technical to the completely casual. Perhaps the most common place you will encounter it is in the media—specifically in health and lifestyle magazines, websites, and social media platforms. Influencers and health professionals use 'fitness' as a broad umbrella term for their content. You'll see headlines like '10 Tips for Better Fitness' or 'The Ultimate Fitness Challenge.' In this context, it often carries a connotation of aspiration and self-improvement.

Social Media
Hashtags like #FitnessMotivation or #FitnessJourney are used millions of times daily.
Gyms/Health Clubs
Often named 'Fitness Centers' or 'Fitness Studios.'

In a medical or clinical setting, you will hear doctors and nurses discuss 'fitness' in relation to surgery or treatment. A patient might be assessed for their 'fitness for surgery,' which refers to whether their heart and lungs are strong enough to withstand the stress of an operation and anesthesia. This is a very specific, high-stakes use of the word. Similarly, in physiotherapy, 'fitness' refers to the functional capacity of a patient to perform daily tasks after an injury. Hearing the word in a hospital usually implies a focus on safety and functional capability.

'The surgeon confirmed the patient's fitness for the upcoming procedure.'

The sports world is another major arena for this word. Commentators during a football match or a tennis tournament will frequently discuss a player's 'match fitness.' This is a specific type of fitness that can only be gained by playing actual games, as opposed to just training in a gym. You might hear, 'He has recovered from his injury, but he lacks match fitness.' This distinction is crucial for sports fans and athletes alike. It highlights that fitness is not a single, static thing, but something that must be tailored to specific activities.

In the workplace, 'fitness' is increasingly heard in the context of 'fitness for work' or 'occupational fitness.' This refers to an employee's ability to perform their job duties safely and effectively. For example, a pilot or a bus driver must maintain a certain level of 'fitness' to keep their license. Additionally, many modern companies have 'fitness programs' as part of their employee benefits, aiming to reduce sick leave and improve productivity by keeping their staff healthy.

'The athlete is working hard to regain his match fitness before the playoffs.'

Fitness Test
A standardized set of exercises to measure physical capability.
Fitness Tracker
A wearable device (like a Fitbit or Apple Watch) that monitors activity.

Finally, you will encounter 'fitness' in academic and scientific contexts, particularly in biology and psychology. As mentioned before, 'evolutionary fitness' is a core concept in biology classes. In psychology, researchers might talk about 'mental fitness' or 'cognitive fitness,' referring to the brain's resilience and ability to process information. Whether you are in a gym, a hospital, a stadium, or a classroom, 'fitness' is a word that describes how well a system—be it a body, a mind, or a species—is functioning in its environment.

'New research suggests that puzzles can help maintain cognitive fitness in older adults.'

One of the most frequent errors learners make with 'fitness' is confusing the noun form with the adjective 'fit.' Because they look similar, students often say things like 'I want to be fitness' or 'He has a very fit body' (which is correct) but then struggle with 'He has a very fitness' (which is incorrect). Remember: 'fit' describes the person, and 'fitness' describes the state or the quality. You *are* fit, but you *have* fitness. This distinction is fundamental to English grammar and is a common pitfall for those at the A1 and A2 levels.

Incorrect
'I exercise to be fitness.' (Noun used as adjective)
Correct
'I exercise for my fitness.' or 'I exercise to be fit.'

Another common mistake involves the countability of the word. In 95% of cases, 'fitness' is an uncountable noun. This means you should not use it in the plural form ('fitnesses') or with the indefinite article 'a' when referring to health. You wouldn't say 'She has a great fitness.' Instead, you would say 'She has a great level of fitness' or simply 'She is very fit.' Using 'fitness' as a countable noun is a major 'red flag' for native speakers and can make your English sound quite unnatural.

'Incorrect: He is doing many fitnesses this week. Correct: He is doing many fitness activities this week.'

Learners also often confuse 'fitness' with 'health.' While they are related, they are not perfectly interchangeable. 'Health' is a broader term that refers to the general state of being free from illness. 'Fitness' is more specific to physical capability and performance. You can be 'healthy' (not sick) but not 'fit' (unable to run a mile). Conversely, an athlete might be very 'fit' but currently 'unhealthy' because they have a cold. Using 'fitness' when you mean 'general health' can sometimes lead to confusion in medical or professional contexts.

In the context of 'suitability,' a common mistake is using the wrong preposition. The correct preposition is almost always 'for.' You talk about 'fitness for purpose' or 'fitness for a task.' Using 'of' or 'to' (e.g., 'fitness of the job') is a common error. Additionally, in the evolutionary sense, learners often think 'survival of the fittest' means the strongest or biggest survive. In biology, 'fitness' means the best *adapted* to the environment, which might mean being the smallest or the quietest. Misunderstanding this can lead to errors in science essays.

'The company was sued because the equipment failed the fitness for purpose test.'

Fitness vs. Health
Fitness = Ability/Performance. Health = Absence of disease.
Fitness vs. Strength
Fitness = Overall condition. Strength = Power of muscles.

Finally, be careful with the word 'fit' in British English slang. While 'fitness' always refers to health or suitability, 'fit' can mean 'physically attractive' in the UK. However, the noun 'fitness' is never used to mean 'attractiveness.' You would never say 'She has a lot of fitness' to mean she is pretty. This is a subtle cultural point that can prevent embarrassing misunderstandings in social situations.

To truly master the word 'fitness,' it is helpful to compare it with its synonyms and related terms. The most direct synonym is often 'health,' but as we've discussed, 'fitness' implies a more active state of capability. Another close relative is 'wellness.' While 'fitness' focuses heavily on the physical body, 'wellness' is a more modern, holistic term that includes mental, emotional, and even spiritual health. You might go to a 'fitness center' to sweat, but you go to a 'wellness retreat' to relax and find balance.

Wellness
A holistic approach to health involving mind and body.
Conditioning
Specific training to improve physical fitness for a sport.
Stamina
The ability to sustain prolonged physical or mental effort.

'Conditioning' is a term often used by athletes and coaches. It is more technical than 'fitness' and refers to the specific process of getting the body ready for a particular activity. For example, a basketball player might have great general 'fitness,' but they need 'pre-season conditioning' to handle the specific jumping and sprinting of the game. 'Stamina' and 'endurance' are also closely related. These words focus specifically on the 'time' aspect of fitness—how long you can keep going. While 'fitness' is the whole package, 'stamina' is just one part of it.

'The coach praised the team's physical conditioning during the final minutes of the game.'

In formal or academic writing, you might encounter 'suitability' or 'aptitude' as synonyms for 'fitness.' If a document discusses a person's 'fitness for a role,' it is talking about their 'suitability.' 'Aptitude' is slightly different, as it refers more to a natural ability to do something rather than a state of being prepared or qualified. However, in many legal contexts, 'fitness' and 'competence' are used interchangeably to describe whether someone is mentally and physically capable of making decisions or performing duties.

'Vigor' and 'vitality' are more literary or old-fashioned synonyms. They describe a sense of energy and life. While you wouldn't usually hear a personal trainer talk about your 'vitality,' you might see it in a marketing brochure for health supplements. These words add a more emotional or energetic 'flavor' to the concept of fitness. On the other end of the spectrum, 'athleticism' refers specifically to the physical qualities of an athlete, like coordination, speed, and grace, which are components of fitness but with an added element of skill.

'At 80, she still has the vitality of someone half her age.'

Aptitude
A natural ability to do something.
Competence
The ability to do something successfully or efficiently.

Understanding these nuances allows you to choose the exact right word for your situation. If you are talking about a gym routine, 'fitness' is perfect. If you are talking about a professional qualification, 'suitability' or 'fitness' works. If you are describing someone who never gets tired, 'stamina' is the most precise. By expanding your vocabulary around 'fitness,' you can describe the human condition with much greater detail and accuracy.

'The marathon runner's endurance was tested by the steep hills.'

How Formal Is It?

Formal

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Pronunciation Guide

Rhymes With
witness litmus

Difficulty Rating

Grammar to Know

Examples by Level

1

I go to the fitness center every Monday.

Je vais au centre de fitness chaque lundi.

Used as a noun modifier for 'center'.

2

Walking is good for your fitness.

Marcher est bon pour votre forme physique.

Uncountable noun after a preposition.

3

He has a fitness app on his phone.

Il a une application de fitness sur son téléphone.

Compound noun: fitness app.

4

My fitness is not very good right now.

Ma forme n'est pas très bonne en ce moment.

Subject of the sentence.

5

Do you like fitness classes?

Aimes-tu les cours de fitness ?

Plural noun 'classes' modified by 'fitness'.

6

She wants to improve her fitness.

Elle veut améliorer sa forme physique.

Direct object of the verb 'improve'.

7

Fitness is important for everyone.

La forme physique est importante pour tout le monde.

General statement using fitness as a subject.

8

He is a fitness instructor.

Il est instructeur de fitness.

Job title using 'fitness'.

1

I am working on my physical fitness this summer.

Je travaille ma forme physique cet été.

Phrasal verb 'working on' + noun.

2

You need a high level of fitness to run a marathon.

Il faut un haut niveau de forme pour courir un marathon.

Phrase: 'level of fitness'.

3

The gym has new fitness equipment.

La salle de sport a de nouveaux équipements de fitness.

Uncountable noun 'equipment' modified by 'fitness'.

4

She joined a fitness club to meet new people.

Elle a rejoint un club de fitness pour rencontrer de nouvelles personnes.

Purpose clause + noun phrase.

5

Daily exercise helps maintain your fitness.

L'exercice quotidien aide à maintenir votre forme.

Verb 'maintain' + possessive + noun.

6

He failed the fitness test for the army.

Il a échoué au test de forme physique pour l'armée.

Specific noun phrase 'fitness test'.

7

Is there a fitness room in this hotel?

Y a-t-il une salle de sport dans cet hôtel ?

Compound noun in a question.

8

Swimming is a great way to build fitness.

La natation est un excellent moyen de se mettre en forme.

Verb 'build' + noun.

1

Regular cycling can significantly boost your cardiovascular fitness.

Le cyclisme régulier peut considérablement augmenter votre forme cardiovasculaire.

Adjective 'cardiovascular' modifying 'fitness'.

2

The program focuses on both mental and physical fitness.

Le programme se concentre sur la forme mentale et physique.

Parallel adjectives modifying the noun.

3

She has reached peak fitness just in time for the competition.

Elle a atteint sa forme optimale juste à temps pour la compétition.

Collocation 'peak fitness'.

4

The company promotes fitness by offering free gym memberships.

L'entreprise encourage la forme en offrant des abonnements gratuits à la salle de sport.

Gerund 'offering' explaining how fitness is promoted.

5

His overall fitness has declined since he stopped playing sports.

Sa forme générale a décliné depuis qu'il a arrêté le sport.

Present perfect tense with 'declined'.

6

The doctor assessed my fitness for the long-distance hike.

Le médecin a évalué mon aptitude pour la randonnée de longue distance.

Noun + preposition 'for' + noun phrase.

7

Many people struggle to find time for fitness in their busy schedules.

Beaucoup de gens ont du mal à trouver du temps pour la forme dans leur emploi du temps chargé.

Abstract noun in a common social context.

8

The fitness industry has grown rapidly over the last decade.

L'industrie du fitness a connu une croissance rapide au cours de la dernière décennie.

Subject noun phrase 'fitness industry'.

1

The court will determine the father's fitness to have custody of the child.

Le tribunal déterminera l'aptitude du père à avoir la garde de l'enfant.

Formal use meaning 'suitability'.

2

Survival of the fittest is a key concept in Darwin's theory of evolution.

La survie du plus apte est un concept clé de la théorie de l'évolution de Darwin.

Superlative adjective 'fittest' used as a noun.

3

The athlete's match fitness was questioned after his long injury layoff.

La forme en match de l'athlète a été remise en question après sa longue absence sur blessure.

Compound noun 'match fitness'.

4

There are concerns about the fitness for purpose of the new software.

Il y a des inquiétudes quant à l'adéquation à l'usage du nouveau logiciel.

Legal/technical phrase 'fitness for purpose'.

5

Yoga can improve your flexibility and core fitness simultaneously.

Le yoga peut améliorer votre souplesse et votre forme abdominale simultanément.

Specific term 'core fitness'.

6

The report highlights the link between physical fitness and cognitive function.

Le rapport souligne le lien entre la forme physique et la fonction cognitive.

Academic style with 'link between'.

7

He underwent a rigorous fitness regime to prepare for the role.

Il a suivi un régime de remise en forme rigoureux pour se préparer au rôle.

Collocation 'rigorous fitness regime'.

8

The building was inspected for its fitness for human habitation.

Le bâtiment a été inspecté pour son aptitude à l'habitation humaine.

Formal/legal prepositional phrase.

1

The candidate's fitness for the position was debated by the board of directors.

L'aptitude du candidat pour le poste a été débattue par le conseil d'administration.

Abstract noun denoting professional suitability.

2

In evolutionary biology, fitness is measured by an organism's genetic contribution to the next generation.

En biologie évolutive, l'aptitude est mesurée par la contribution génétique d'un organisme à la génération suivante.

Technical scientific definition.

3

The pervasive 'fitness culture' on social media can sometimes lead to body dysmorphia.

La 'culture du fitness' omniprésente sur les réseaux sociaux peut parfois mener à la dysmorphie corporelle.

Sociological term 'fitness culture'.

4

The judge ruled that the defendant lacked the mental fitness to stand trial.

Le juge a statué que le défendeur n'avait pas l'aptitude mentale pour être jugé.

Legal term 'mental fitness'.

5

The study explores the correlation between aerobic fitness and academic performance in teenagers.

L'étude explore la corrélation entre la forme aérobie et la performance académique chez les adolescents.

Academic 'correlation between' structure.

6

The athlete is striving to regain the peak fitness he enjoyed before the accident.

L'athlète s'efforce de retrouver la forme optimale qu'il avait avant l'accident.

Relative clause 'he enjoyed before...'.

7

The fitness of his arguments was undermined by a lack of empirical evidence.

La pertinence de ses arguments a été minée par un manque de preuves empiriques.

Metaphorical use meaning 'soundness' or 'validity'.

8

Environmental changes can drastically alter the fitness of a species within its niche.

Les changements environnementaux peuvent radicalement altérer l'aptitude d'une espèce au sein de sa niche.

Biological context: 'fitness of a species'.

1

The philosopher questioned the moral fitness of the ruler to lead the nation.

Le philosophe a remis en question l'aptitude morale du souverain à diriger la nation.

Highly formal/abstract use.

2

The algorithm uses a fitness function to evaluate the success of each iteration.

L'algorithme utilise une fonction d'aptitude pour évaluer le succès de chaque itération.

Technical term in computer science.

3

Her intellectual fitness was evident in the way she deconstructed the complex theory.

Son aptitude intellectuelle était évidente dans la manière dont elle a déconstruit la théorie complexe.

Metaphorical use for cognitive ability.

4

The Darwinian paradigm posits that fitness is not an absolute trait but an environmentally contingent one.

Le paradigme darwinien postule que l'aptitude n'est pas un trait absolu mais un trait dépendant de l'environnement.

Advanced academic vocabulary and structure.

5

The document meticulously outlines the criteria for the fitness of the materials used in the aerospace project.

Le document expose méticuleusement les critères d'aptitude des matériaux utilisés dans le projet aérospatial.

Technical/engineering use meaning 'suitability for extreme conditions'.

6

The sudden shift in the market tested the fitness of the company's business model.

Le changement soudain du marché a testé la viabilité du modèle d'affaires de l'entreprise.

Metaphorical use for business resilience.

7

The athlete's pursuit of fitness had become an all-consuming obsession, bordering on the pathological.

La quête de forme de l'athlète était devenue une obsession dévorante, frôlant le pathologique.

Complex descriptive sentence with high-level adjectives.

8

The legal concept of 'fitness for purpose' serves as a cornerstone of consumer protection law.

Le concept juridique d' 'adéquation à l'usage' sert de pierre angulaire au droit de la protection des consommateurs.

Legal terminology in a complex sentence.

Synonyms

health stamina well-being strength vigor robustness

Antonyms

weakness illness unhealthiness

Common Collocations

Physical fitness
Fitness level
Fitness regime
Fitness tracker
Fitness instructor
Cardiovascular fitness
Improve fitness
Maintain fitness
Peak fitness
Fitness for purpose

Common Phrases

Get in fitness

Work on your fitness

Fitness test

Fitness goals

Fitness challenge

Fitness center

Health and fitness

Fitness routine

Mental fitness

Match fitness

Often Confused With

fitness vs Fittings

fitness vs Fitnesses

fitness vs Fitting

Idioms & Expressions

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Easily Confused

fitness vs

fitness vs

fitness vs

fitness vs

fitness vs

Sentence Patterns

How to Use It

Scientific

In biology, fitness is a quantitative measure of reproductive success.

British vs American

Usage is largely the same, though 'match fitness' is more common in British English.

Common Mistakes
  • Using 'fitness' as an adjective (e.g., 'He is very fitness').
  • Pluralizing the noun in a health context (e.g., 'I have many fitnesses').
  • Confusing 'fitness' with 'fittings' (related to equipment or clothes).
  • Using 'fitness of' when 'fitness for' is required for suitability.
  • Assuming 'fittest' always means 'strongest' in a biological context.

Tips

Noun vs Adjective

Remember: 'fit' is the adjective, 'fitness' is the noun. Use 'fitness' after possessives like 'my' or 'his'.

Collocations

Learn 'improve fitness' and 'maintain fitness' as single units of meaning to speak more fluently.

Suitability

In professional settings, 'fitness' often means 'being qualified' rather than 'being strong'.

The 'S' sound

The 'ss' at the end of fitness is a soft 's' sound, like in 'hiss,' not a 'z' sound.

Avoid Plurals

Never write 'fitnesses' unless you are writing a PhD paper in evolutionary biology.

Compound Nouns

Use 'fitness' as a prefix for gym-related words: fitness center, fitness goal, fitness plan.

Key Phrases

Listen for 'fitness test' in movies about the military or police—it's a common plot point.

Evolution

In biology, fitness = babies. The more offspring an organism has, the higher its biological fitness.

Fitness Culture

Be aware that 'fitness' is a huge social media topic; hashtags can help you see how it's used today.

Survival

Use 'survival of the fittest' to describe competitive business or social environments.

Memorize It

Mnemonic

FITness: Functional, Intense Training makes you healthy.

Word Origin

Middle English

Cultural Context

High value on individual physical fitness as a sign of health.

Darwin's 'survival of the fittest' is often misunderstood as 'strongest' rather than 'best adapted'.

Practice in Real Life

Real-World Contexts

Conversation Starters

"How do you maintain your fitness?"

"Do you use any fitness apps?"

"What are your fitness goals for this year?"

"Is fitness important in your culture?"

"What's the best fitness class you've ever taken?"

Journal Prompts

Describe your current fitness level and how you feel about it.

How has your definition of fitness changed over the years?

Write about a time you had to prove your fitness for a task.

Do you think the fitness industry is helpful or harmful?

What does 'mental fitness' mean to you?

Frequently Asked Questions

10 questions

No, it is usually uncountable. You say 'much fitness' or 'levels of fitness,' not 'many fitnesses.' However, in biology, 'fitnesses' can be used to compare different organisms.

Health is the general absence of disease. Fitness is the specific ability to perform physical tasks and exercise.

It is a legal and technical term meaning that a product or person is suitable for the job they are intended to do.

No, you must say 'I am fit' (adjective) or 'I have good fitness' (noun).

It is the specific physical condition required to play a full game of a sport, which is different from general gym fitness.

Yes, to describe if a business model is 'fit' for the market or if an employee is 'fit' for a role.

The most common opposite is 'unfitness,' though 'weakness' or 'illness' are used in specific contexts.

Use it to refer to the success of an organism in passing its genes to the next generation.

It is neutral. It can be used in casual talk ('my fitness') and formal reports ('fitness for duty').

Usually, they are cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition.

Test Yourself 180 questions

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