Malica Astin, 11, never paid much attention to how much physical activity she got. But one day she played basketball while wearing a small activity tracker called a Zamzee on her waist. Later, she plugged it into a computer's USB port and uploaded the data captured by the device's accelerometers. Unlike a FitBit, a popular pedometer geared to adults, Malica's Zamzee didn't tell her how many steps she took or calories she burned. Instead, it gave her points for the movements she made.

Even months later, she recalls the details of that first windfall: 758 points. And why not? The points are a currency that she can spend in the virtual world of Zamzee.com, where she created an avatar and outfitted it with braces, a necklace, and a hula skirt.

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