Physical Fitness, ability of the human body to function with vigor and alertness, without undue fatigue, and with ample energy to engage in leisure activities, and to meet physical stresses. Muscular strength and endurance, cardiorespiratory integrity, and general alertness are the overt signs of physical fitness.
Physical fitness is usually measured in relation to functional expectations—that is, typically, by periodic tests measuring strength, endurance, agility, coordination, and flexibility. In addition, stress testing, which ascertains the body's accommodation to powerful, sustained physical stimuli, is used to analyze fitness. If individuals are able to accommodate to the stressors, they are assumed to be fit.
The level of physical fitness can be influenced by regular, systematic exercise. Moderate activity will maintain the individual at a level that is usually adequate to handle ordinary stress. If the fitness level is to be improved, however, it is necessary to participate in more intensive exercise that overloads the physiological systems and thus promotes change.
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