Aristotle helped define the criteria of fitness 2, 500 years ago when he explained that a thing that suits its function well is fit. Luckily for us, the cardiovascular system, lungs, skeleton, muscles, endocrine system and all of the other astounding parts of your body function for our purpose: to stay well.

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Some of the major goals of exercise are to improve muscle tone, strength, and endurance. All of this is made possible by, and requires, the body's energy production-and-use system. Central to that system is a complex molecule called ATP, Adenosine Triphosphate.

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Being flexible – having well lubricated joints and stretchable muscles – is one of the best ways to reduce the prospect of injury and give you the basis for a wide variety of workout routines.

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Gyms offer a number of benefits, both practical and psychological. But there are a few caveats to consider before taking the plunge.

Few could afford to buy the variety of equipment that gyms typically offer. Multi-station weight machines are just the beginning. Most gyms have treadmills, stationary rowing equipment, stretching bars, etc.

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Most articles on fitness, when discussing routines and exercises will recommend consulting a physician first. That isn't just a means of covering the author against potential legal action. It's a recognition of the fact that exercise, done improperly, can be harmful and sometimes you can't get everything you need to know with a few web searches.

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