Allyson Felix's 200-meter win leads big day for U.S. at Olympics

U.S. track and field athletes win three of four events and seven of 12 medals Wednesday. Allyson Felix snags her first individual Olympic gold in 21.88 seconds.

LONDON — Allyson Felix's running style is so elegant, it's easy for her to lapse into floating like a butterfly when she should sting like a bee. "It's a gift and a curse because it looks very fluid," she said. "It's nice, but sometimes you have to get into an aggressive mode."

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