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Physical Fitness – What is it? How?

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Most human beings realize it or want to increase their practice, in order to have good health and physical state road, but never ask ourselves, what is physical activity?

Caspersen, Powell and Christenson physical activity defined as "any bodily movement produced by skeletal muscles that results in energy expenditure." Doctors propose a simple but interesting formula to find the total energy expenditure that we have each day, and is as follows: