Biomechanics is the research and analysis of the mechanics of living organisms. Aristoteles might be considered the first biomechanicist. He wrote the first book called "De Motu Animalium" - On the Movement of Animals. He not only saw animals' bodies as mechanical systems, but pursued such questions as the physiological difference between imagining performing an action and actually doing it. (Read more about the history of Biomechanics in A Genealogy of Biomechanics.) The research and analysis can be carried forth on multiple levels, from the molecular, wherein molecular biomaterials such as collagen and elastin are considered, to the macroscopic level, all the way up to the tissue and organ level. Some simple applications of Newtonian Mechanics can supply correct approximations on each level, but precise details...

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A prescribed dietary supplement supplies nutrients (usually vitamins or minerals) that are missing or not consumed in sufficient quantity in a person's diet. In the United States, a dietary supplement is defined under the Dietary Supplement Health and Education Act of 1994 as a product that meets each of the following criteria:

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1. It is intended to supplement the diet and bears or contains one or more of the following dietary ingredients:
   • a vitamin,
   • a mineral,
   • an herb or other botanical (excluding tobacco)...

Plyometrics is a type of exercise that uses explosive movements to develop muscular power. It may be used, for example, to improve the effectiveness of a boxer's punch, or to increase the vertical jumping ability of a basketball player. Power is a combination of strength and speed. The ability to generate a force in a short time allows for athletic movements beyond what raw strength will allow. Thus an athlete who has strong legs and can perform the freeweight squat with heavy weights may not be able to jump as high as another athlete who is not as strong but can generate more force in a short time. Plyometrics allows an athlete to develop more power because of the way muscles work. For a muscle to cause movement it contracts; this is known as a concentric contraction. There is a maximum amount of power with which a certain...

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