Though stereotypes are dissolving with each generation, there are some that persist – in part, because they are based on real differences between men and women.

While some women can and do achieve the upper body strength of some (even very fit) men, the overwhelming majority of males have a natural advantage in this area. Male aesthetic values, the source of which isn't clear, reinforce this and so they tend to work on upper body more than some other areas, relative to women's efforts.

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Body fluid level is an important component of keeping it in top condition for best performance.

As a person exercises, the internal body temperature rises. That triggers the body to release internal fluid to the outside through millions of sweat glands and via heightened respiration. As the high temperature sweat evaporates off the skin, it takes heat with it, cooling the body down again.

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Exercise throughout the entire nine months is healthy for most women – provided they exercise (pun intended) the proper caution.

Mild exercise, of types appropriate to the various stages, will help keep the circulatory system healthy, increase pelvic muscle tone and strength, and help to smooth out mood swings. Done right, you can lessen the severity of backaches, keep joints flexible and firm, and improve sleep.

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Individuals under 20 are naturally more flexible, have higher metabolic rates and more energy than those older. But they, too, need to exercise (in appropriate ways) to avoid injury and build strength and endurance, avoid obesity and stay fit.

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Few subjects in health or diet ever get put to a final rest. Present studies often contradict earlier ones, until no one knows what to think. One of the few areas that almost all serious studies seem to agree on is the relationship between exercise and the immune system.

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