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Which activities burn the most calories?

Find out whether ab machines really work as fitness expert Greg Shealey answers this common question about diet and fitness.

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A person's waist measurement has more meaning than you think. Learn more about what is behind your waist measurement and how it relates to your health.

Dukan Diet: What You Need to Know

Don't mistake the Dukan Diet -- known as the French Atkins diet -- with French cuisine. Is this classic low-carb, high-protein diet too good to be true?

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