Harpers Bazaar - The Booty Shrinking Workout

Although many women obsess about their weight, what they really want to gain from constant workouts and cutting carbs is less fat. So the scale can be deceiving. "You don't know how much of that number is muscle and how much is fat—and muscle weighs more," says Jinger Gottschall, an associate professor of kinesiology at Penn State University.

Enter S10 Training, a new workout method that stands for sub-10, because the goal is not to concern yourself with your scale but to focus instead on lowering your body fat below 10 percent (recommended for men; women are encouraged to achieve 15 percent).

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