Physical fitness comprises two related concepts: general fitness (a state of health and well-being), and specific fitness (a task-oriented definition based on the ability to perform specific aspects of sports or occupations). Physical fitness is generally achieved through correct nutrition, exercise, and enough rest.

In previous years[when?], fitness was commonly defined as the capacity to carry out the day’s activities without undue fatigue. However, as automation increased leisure time, changes in lifestyles following the industrial revolution rendered this definition insufficient. In current contexts, physical fitness is considered a measure of the body’s ability to function efficiently and effectively in work and leisure activities, to be healthy, to resist hypokinetic diseases, and to meet emergency situa

The President's Council on Physical Fitness and Sports—a study group sponsored by the government of the United States—declines to offer a simple definition of physical fitness. Instead, it developed the following chart:[1]

Health related Skill related Sports

Metabolic

Morphological

Bone integrity

Other

Body composition

Cardiovascular fitness

Flexibility

Muscular endurance

Muscle strength

Agility

Balance

Coordination

Power

Speed

Reaction time

Other

Team sport

Individual sport

Lifetime

Other

A comprehensive fitness program tailored to an individual will probably focus on one or more specific skills,[2] and on age-[3] or health-related needs such as bone health.[4] Many sources[citation needed] also cite mental, social and emotional health as an important part of overall fitness. This is often presented in textbooks as a triangle made up of three points, which represent physical, emotional, and mental fitness. Physical fitness can also prevent or treat many chronic health conditions brought on by unhealthy lifestyle or aging.[5] Working out can also help people sleep better. To stay healthy it is important to engage in physical activity.[6]

Training

Specific or task-oriented fitness is a person's ability to perform in a specific activity with a reasonable efficiency: for example, sports or military service. Specific training prepares athletes to perform well in their sports.

Examples are:

400 m sprint: in a sprint the athlete must be trained to work anaerobically throughout the race.

Marathon: in this case the athlete must be trained to work aerobically and their endurance must be built-up to a maximum.

Many fire fighters and police officers undergo regular fitness testing to determine if they are capable of the physically demanding tasks required of the job.[7]

Soldiers of the United States Army must be able to pass the Army Physical Fitness Test (APFT)

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