Muscular fitness has two components: muscular strength and muscular endurance.
Muscular strength is the greatest amount of force a muscle or muscle group can exert in a single effort.
Muscular endurance is the ability of a muscle or muscle group to do repeated contractions against a less-than-maximum resistance for a given time.
Although muscular endurance and strength are separate fitness components, they are closely related. Progressively working against resistance will produce gains in both of these components.
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U.S. Army Field Manual 21-20 is the source material for this website. A soldier's level of physical fitness has a direct impact on his combat readiness. The many battles in which American troops have fought under-score the important role physical fitness plays on the battlefield. The renewed nationwide interest in fitness has been accompanied by many research studies on the effects of regular participation in sound physical fitness programs. The overwhelming conclusion is that such programs enhance a person's quality of life, improve productivity, and bring about positive physical and mental changes. Not only are physically fit soldiers essential to the Army, they are also more likely to have enjoyable, productive lives, and you can too.