Gold-Medal Tech

Athletes turn to a Swiss video company, Dartfish, for Olympic perfection

Tara Kirk, a Stanford senior and an Olympic-swimming-medal hopeful, swore her body was straight in the water as she raced. Then she looked at herself on the small screen. Her coach had popped open a laptop and, using a software program called Dartswim, superimposed a picture of Kirk's technique from 2002 on an image of her current form. The message was clearer than a chlorinated pool: despite some improvement, she still arched her body during the strokes, adding seconds to her time. "You can't go with what you feel," says her college coach, Richard Quick. "Tara felt like she was doing...

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