The company strives to address not only muscle building but also weight loss and general fitness through daily nutritional supplement regimens.

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Pushing back can cause some "very touchy" conversations, however, says Becky Hand, a registered dietitian with the weight-loss and fitness website SparkPeople, based in Cincinnati.

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Its Bellydance: Fitness for Weight Loss, Hip Drop Hip Hop--30 minutes of traditional hip- and rib-wriggling motions set to a modern, upbeat tempo--burns calories and fat, while supposedly aiding digestion.

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Personal trainers provide clients with programs to achieve their goals, Van Daff says, whether that's weight loss, muscle building or overall fitness.

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Over twelve weeks, researchers at the University of Indiana divided weight loss participants into two groups: a group that went to a traditional fitness center and a group that received their workout training and advice at a virtual gym through Second Life.

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The health and fitness industry is full of promises, from pills and shakes that promise weight loss with little or no effort, to drugs that cause horrific side effects and can put your health at risk.

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