Choose specific exercises that fit into your routine and do them consistently, Dugas says.

选择可以融入你的日常训练的针对性练习，并持之以恒，杜佳斯说。

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"It's about being equally strong everywhere, not just having your legs go fast," says Dugas.

“要跑快，需要要周身强健，而不仅仅是靠腿”杜佳斯说。

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Dugas has been natural for 12 years, and said an old picture of her mother's afro originally inspired her to blow her own hair out.

杜佳思的自然爆炸头已经留了12年，她说最早是因为看到一张相片，相片里她母亲就留了个爆炸头，于是突发灵感，想把自己的头发也蓬成那样。

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"As long as you're with the front pack, there's a feeling that you're safe, " says Jonathan Dugas, a sports scientist and author of the blog Science of Sport.

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"In our planning process for 2010, we assumed conditions in the U.S. housing industry would be comparable with the second half of 2009, with relatively stable demand and pricing, " said RichardDugasRichard Dugas, PulteGroup's chief executive.

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Dugas said that market conditions are expected to remain relatively stable for the rest of the year, but high resale inventory, particularly foreclosure inventory, expiration of the tax credit and weak consumer confidence could limit the pace of housing's recovery for several more quarters.

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