Most upper body exercises have as their goal to build strength. In order to maximize the beneficial effect of the routine, you'll want to mix in some good cardiovascular workouts – spinning, jogging, etc – and alternate the activities with lower body work.

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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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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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What kind of leg exercises you do will, of course, depend on your goal. Are you trying to build massive thighs or heart-shaped calves? Do you want to build strength, increase running endurance or improve balance and flexibility? Are you a weight-lifter, a jogger or a ballerina?

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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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