Chapter 2
Chapter 2
Physical Fitness Defined
Basic Definitions
Physical activity
Any bodily movement produced by skeletal muscles, which results in energy expenditure.
Exercise
Physical activity that is planned, structured, repetitive, and purposive, in the sense that improvement or maintenance of physical fitness is an objective.
Meaning of Physical Fitness
WHO, 1971
The ability to perform muscular work satisfactorily.
CDC, 1985; Surgeon General, 1996
A set of attributes that people have or achieve that relates to the ability to perform physical activity.
President’s Council on Physical Fitness and Sports, 1971
The ability to carry out daily tasks with vigor and alertness, without undue fatigue and with ample energy to enjoy leisure-time pursuits and to meet unforeseen emergencies.
Skill-Related Components
agility The ability to rapidly change the position of the entire body in space with speed and accuracy (e.g., dribbling a basketball back and forth between defenders).
balance The maintenance of balance while stationary or moving (e.g., a gymnast performing movements on a balance beam).
coordination The ability to use the senses, such as sight and hearing, together with body parts in performing tasks smoothly and accurately (e.g., kicking a soccer ball into the goal).
power The rate at which one can perform difficult work (e.g., a football lineman pushing back a defender).
reaction time The time elapsed between stimulation and the beginning of the reaction to it (e.g., a sprinter reacting to the starting gun).
speed The ability to perform a movement within a short period of time (e.g., a fast time in the 40-yard dash for a football running back).
The Elements of Health-Related Physical Fitness
Cardiorespiratory endurance or aerobic fitness
Body composition
Musculoskeletal fitness or muscular fitness
Flexibility
Muscular strength
Muscular endurance
Cardiorespiratory Endurance
The ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity.
Body Composition
The body’s relative amount of fat, and lean body tissue or fat-free mass. Percent body fat, which is the percent of total weight represented by fat weight, is the preferred index used to evaluate a person’s body composition.
Musculoskeletal Fitness
Flexibility
The functional capacity of the joints to move through a full range of movement.
Musculoskeletal Fitness
Muscular Strength
The ability of the muscle to exert force. The maximal one-effort force that can be exerted against a resistance.
Musculoskeletal Fitness
Muscular Endurance
The muscle’s ability to continue to perform without fatigue. The ability of the muscles to apply a submaximal force repeatedly.
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