For those with anything left to spend after the holiday excesses, what better causes to spend it on than sport and fitness? Every year, the American desire to wed high-tech creativity with recreational activity grows more intense -- and the resulting gizmos grow more intriguing and elaborate. No innovation is safe from rethinking: last year's air-filled running shoe, for example, is now competing against a new computer-designed number from Puma that needs no laces, straps or Velcro fasteners. The Puma Disc tightens by means of an invisible system: a turn of the dial on the shoe's tongue compresses connecting sleeves around...
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