Sweat popped out on the reddened faces of 12-year-old Jakob Njos and 15-year-old Emily Njos, evidence that they had raised their heart rate while holding remote controls and punching the air as they stood in front of a television set.
The siblings had just finished a round of virtual boxing, one of several Nintendo Wii Sports games they got for Christmas. Onscreen, customized Mii cartoon figures representing each of them "fought" until there was a knockout. Sweat flew from the faces of the virtual characters, too.
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